You can change actionMode title font using custom actionMode
style
first create custom style
<style name="ActionMode" parent="@style/Widget.AppCompat.ActionMode">
<item name="titleTextStyle">@style/ActionMode.Title</item>
<item name="android:titleTextStyle">@style/ActionMode.Title</item>
</style>
<style name="ActionMode.Title" parent="@style/TextAppearance.AppCompat.Widget.ActionMode.Title">
<item name="android:textColor">your color</item>
<item name="fontFamily">@font/yourfont</item>
<item name="android:fontFamily">@font/your font</item>
<item name="textSize">15sp</item>
<item name="android:textSize">15sp</item>
</style>
Now put in to your main style style.xml
<style name="Theme.Tarif.Light" parent="Theme.MaterialComponents.Light.NoActionBar">
<item name="windowActionModeOverlay">true</item>
<item name="android:windowLayoutInDisplayCutoutMode" tools:targetApi="p">shortEdges</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="colorPrimary">@color/light_primary</item>
<item name="colorPrimaryDark">@color/light_primary</item>
<item name="colorAccent">@color/green_500</item>
<item name="android:windowBackground">@color/light_primary</item>
<!--ActionMode-->
<item name="actionModeStyle">@style/ActionMode</item>
</style>