diff --git a/app/src/main/java/io/github/sspanak/tt9/ui/main/keys/SoftKey.java b/app/src/main/java/io/github/sspanak/tt9/ui/main/keys/SoftKey.java
index 8d96c7e4..53e8fcea 100644
--- a/app/src/main/java/io/github/sspanak/tt9/ui/main/keys/SoftKey.java
+++ b/app/src/main/java/io/github/sspanak/tt9/ui/main/keys/SoftKey.java
@@ -281,6 +281,8 @@ public class SoftKey extends com.google.android.material.button.MaterialButton i
 	private Drawable getIconCompat() {
 		if (icon == null && getCentralIcon() > 0) {
 			icon = AppCompatResources.getDrawable(getContext(), getCentralIcon());
+		} else if (getCentralIcon() <= 0) {
+			icon = null;
 		}
 
 		return icon;
@@ -293,6 +295,8 @@ public class SoftKey extends com.google.android.material.button.MaterialButton i
 	private Drawable getHoldIconCompat() {
 		if (holdIcon == null && getHoldIcon() > 0) {
 			holdIcon = AppCompatResources.getDrawable(getContext(), getHoldIcon());
+		} else if (getHoldIcon() <= 0) {
+			holdIcon = null;
 		}
 
 		return holdIcon;
diff --git a/app/src/main/java/io/github/sspanak/tt9/ui/main/keys/SoftKeyFilter.java b/app/src/main/java/io/github/sspanak/tt9/ui/main/keys/SoftKeyFilter.java
index 0a874a37..a83a3579 100644
--- a/app/src/main/java/io/github/sspanak/tt9/ui/main/keys/SoftKeyFilter.java
+++ b/app/src/main/java/io/github/sspanak/tt9/ui/main/keys/SoftKeyFilter.java
@@ -2,8 +2,8 @@ package io.github.sspanak.tt9.ui.main.keys;
 
 import android.content.Context;
 import android.util.AttributeSet;
-import android.view.Gravity;
 
+import io.github.sspanak.tt9.R;
 import io.github.sspanak.tt9.languages.LanguageKind;
 import io.github.sspanak.tt9.ui.Vibration;
 
@@ -12,16 +12,10 @@ public class SoftKeyFilter extends SoftKey {
 	public SoftKeyFilter(Context context, AttributeSet attrs) { super(context, attrs); }
 	public SoftKeyFilter(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); }
 
-	@Override
-	protected float getTitleScale() {
-		return isKorean() ? 1.5f * getTT9Height() : Math.min(getTT9Width(), getTT9Height());
-	}
-
 	private boolean isKorean() {
 		return tt9 != null && LanguageKind.isKorean(tt9.getLanguage());
 	}
 
-
 	@Override
 	protected void handleHold() {
 		if (isKorean()) {
@@ -51,24 +45,14 @@ public class SoftKeyFilter extends SoftKey {
 	}
 
 
-	@Override
-	protected String getTitle() {
-		return isKorean() ? "␣" : "FLTR";
-	}
-
-
-	@Override
-	protected String getHoldText() {
-		return isKorean() ? null : "CLR";
-	}
+	@Override protected String getTitle() { return isKorean() ? "␣" : ""; }
+	@Override protected int getCentralIcon() { return isKorean() ? 0 : R.drawable.ic_fn_filter; }
+	@Override protected int getHoldIcon() { return isKorean() ? 0 : R.drawable.ic_fn_filter_off; }
 
+	@Override protected float getTitleScale() { return isKorean() ? 1.5f * getTT9Height() : 1; }
 
 	@Override
 	public void render() {
-		setGravity(
-			isKorean() ? Gravity.TOP | Gravity.CENTER_HORIZONTAL: Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL
-		);
-
 		if (tt9 != null) {
 			setEnabled(
 				!tt9.isInputModeNumeric()
diff --git a/app/src/main/res/drawable/ic_fn_filter.xml b/app/src/main/res/drawable/ic_fn_filter.xml
new file mode 100644
index 00000000..3ebe284d
--- /dev/null
+++ b/app/src/main/res/drawable/ic_fn_filter.xml
@@ -0,0 +1,3 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:tint="#000000" android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+	<path android:fillColor="@android:color/white" android:pathData="M7,6h10l-5.01,6.3L7,6zM4.25,5.61C6.27,8.2 10,13 10,13v6c0,0.55 0.45,1 1,1h2c0.55,0 1,-0.45 1,-1v-6c0,0 3.72,-4.8 5.74,-7.39C20.25,4.95 19.78,4 18.95,4H5.04C4.21,4 3.74,4.95 4.25,5.61z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_fn_filter_off.xml b/app/src/main/res/drawable/ic_fn_filter_off.xml
new file mode 100644
index 00000000..bb446bb7
--- /dev/null
+++ b/app/src/main/res/drawable/ic_fn_filter_off.xml
@@ -0,0 +1,4 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:tint="#000000" android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+	<path android:fillColor="@android:color/white" android:pathData="M16.95,6l-3.57,4.55l1.43,1.43c1.03,-1.31 4.98,-6.37 4.98,-6.37C20.3,4.95 19.83,4 19,4H6.83l2,2H16.95z"/>
+	<path android:fillColor="@android:color/white" android:pathData="M2.81,2.81L1.39,4.22L10,13v6c0,0.55 0.45,1 1,1h2c0.55,0 1,-0.45 1,-1v-2.17l5.78,5.78l1.41,-1.41L2.81,2.81z"/>
+</vector>
diff --git a/app/src/main/res/layout/panel_numpad_right.xml b/app/src/main/res/layout/panel_numpad_right.xml
index f049d320..fe17e7d7 100644
--- a/app/src/main/res/layout/panel_numpad_right.xml
+++ b/app/src/main/res/layout/panel_numpad_right.xml
@@ -9,20 +9,16 @@
 		android:id="@+id/soft_key_numpad_backspace" />
 
 	<RelativeLayout style="@style/TTheme.Numpad.Key.Overlay.Wrapper">
-
 		<io.github.sspanak.tt9.ui.main.keys.SoftKeyFilter
 			style="@style/TTheme.Numpad.Key"
 			android:id="@+id/soft_key_filter" />
-
-		<include layout="@layout/key_overlay_hold_text" />
+		<include layout="@layout/key_overlay_icons" />
 	</RelativeLayout>
 
 	<RelativeLayout style="@style/TTheme.Numpad.Key.Overlay.Wrapper">
-
 		<io.github.sspanak.tt9.ui.main.keys.SoftKeyRF3
 			style="@style/TTheme.Numpad.Key"
 			android:id="@+id/soft_key_rf3" />
-
 		<include layout="@layout/key_overlay_icons" />
 	</RelativeLayout>
 
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
index d9a863b2..8893343b 100644
--- a/app/src/main/res/values/dimens.xml
+++ b/app/src/main/res/values/dimens.xml
@@ -1,14 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-	<dimen name="status_bar_height">26sp</dimen>
-	<dimen name="status_bar_font_size">16sp</dimen>
-	<dimen name="main_small_suggestion_font_size">18sp</dimen> <!-- for some reason the RecyclerView displays the text smaller than the TextView, so we to make the suggestions slightly bigger than the regular Status Bar text. -->
+	<!--
+	All keyboard element text sizes must be in "dp" instead of "sp"
+	to ignore the Android text size scale. We can't allow scaling because it breaks the layout.
+	-->
+
+	<!-- standard font size for suggestions and keys -->
+	<dimen name="main_text_size">18dp</dimen>
+
+	<!-- Status Bar -->
+	<dimen name="status_bar_height">26dp</dimen>
+	<dimen name="status_bar_text_size">16dp</dimen>
+
+	<!-- Main Small -->
 	<dimen name="main_small_suggestion_padding_horizontal">6sp</dimen>
 
 	<dimen name="main_small_key_icon_size">32sp</dimen>
-	<dimen name="main_small_key_wrapper_height">46dp</dimen> <!-- key height + margin -->
-
 	<dimen name="main_small_key_text_editing_height">65dp</dimen>
+	<dimen name="main_small_key_wrapper_height">46dp</dimen> <!-- key height + margin -->
 
 	<!-- Preferences, default font size -->
 	<dimen name="preferences_text_min_height">48dp</dimen>
@@ -34,11 +43,11 @@
 	<dimen name="numpad_function_key_layout_weight">0.675</dimen>
 
 	<dimen name="numpad_key_overlay_z">666dp</dimen>
-	<dimen name="numpad_key_overlay_small_icon_size">13sp</dimen>
-	<dimen name="numpad_key_overlay_text_size">11sp</dimen>
+	<dimen name="numpad_key_overlay_small_icon_size">13dp</dimen>
+	<dimen name="numpad_key_overlay_text_size">11dp</dimen>
 	<dimen name="numpad_key_overlay_side_text_margin">2dp</dimen>
 
-	<dimen name="numpad_suggestion_font_size">17sp</dimen>
+	<dimen name="numpad_suggestion_font_size">17dp</dimen>
 	<dimen name="numpad_suggestion_height">40dp</dimen>
 	<dimen name="numpad_suggestion_min_width">36dp</dimen>
 </resources>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 73f02ee8..a5673ef9 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -44,7 +44,7 @@
 		<item name="android:layout_height">match_parent</item>
 		<item name="android:layout_width">match_parent</item>
 
-		<item name="android:textSize">@dimen/status_bar_font_size</item>
+		<item name="android:textSize">@dimen/status_bar_text_size</item>
 		<item name="android:textStyle">italic</item>
 		<item name="android:textColor">@color/keyboard_text_color</item>
 	</style>
@@ -64,7 +64,11 @@
 		<item name="android:paddingLeft">@dimen/main_small_suggestion_padding_horizontal</item>
 		<item name="android:paddingRight">@dimen/main_small_suggestion_padding_horizontal</item>
 
-		<item name="android:textSize">@dimen/main_small_suggestion_font_size</item>
+		<!--
+		for some reason the RecyclerView displays the text smaller than the TextView,
+		so we to make the suggestions slightly bigger than the regular Status Bar text.
+		-->
+		<item name="android:textSize">@dimen/main_text_size</item>
 	</style>
 
 
@@ -93,6 +97,7 @@
 		<item name="android:paddingTop">0dp</item>
 		<item name="android:paddingBottom">0dp</item>
 		<item name="android:textAppearance">@style/TextAppearance.AppCompat.Medium</item>
+		<item name="android:textSize">@dimen/main_text_size</item>
 
 		<item name="android:textColor">@color/key_num_color</item>
 		<item name="backgroundTint">@color/key_num_background</item>
@@ -123,7 +128,7 @@
 		<item name="android:paddingRight">0dp</item>
 
 		<item name="android:textAppearance">@style/TextAppearance.AppCompat</item>
-		<item name="android:textSize">@dimen/status_bar_font_size</item>
+		<item name="android:textSize">@dimen/status_bar_text_size</item>
 
 		<item name="android:textColor">@color/key_num_color</item>
 		<item name="drawableTint">@color/key_num_color</item>
@@ -290,6 +295,7 @@
 		<item name="android:padding">0dp</item>
 
 		<item name="android:textAppearance">@style/TextAppearance.AppCompat.Medium</item>
+		<item name="android:textSize">@dimen/main_text_size</item>
 
 		<item name="android:textColor">@color/keyboard_text_color</item>
 		<item name="backgroundTint">@color/key_fn_background</item>