diff --git a/app/src/main/res/layout/chat_room_master_fragment.xml b/app/src/main/res/layout/chat_room_master_fragment.xml
index 79f0e07cf..2d8609dc2 100644
--- a/app/src/main/res/layout/chat_room_master_fragment.xml
+++ b/app/src/main/res/layout/chat_room_master_fragment.xml
@@ -32,7 +32,7 @@
         tools:context=".MainActivity">
 
     <RelativeLayout
-        android:layout_width="280dp"
+        android:layout_width="@dimen/master_fragment_width"
         android:layout_height="match_parent"
         android:layout_gravity="start">
 
diff --git a/app/src/main/res/layout/contact_master_fragment.xml b/app/src/main/res/layout/contact_master_fragment.xml
index ada3c7640..7ea54d351 100644
--- a/app/src/main/res/layout/contact_master_fragment.xml
+++ b/app/src/main/res/layout/contact_master_fragment.xml
@@ -29,7 +29,7 @@
         tools:context=".MainActivity">
 
         <RelativeLayout
-            android:layout_width="280dp"
+            android:layout_width="@dimen/master_fragment_width"
             android:layout_height="match_parent"
             android:layout_gravity="start">
 
diff --git a/app/src/main/res/layout/history_master_fragment.xml b/app/src/main/res/layout/history_master_fragment.xml
index b09f5e1d3..f02a576ce 100644
--- a/app/src/main/res/layout/history_master_fragment.xml
+++ b/app/src/main/res/layout/history_master_fragment.xml
@@ -26,7 +26,7 @@
         tools:context=".MainActivity">
 
         <RelativeLayout
-            android:layout_width="280dp"
+            android:layout_width="@dimen/master_fragment_width"
             android:layout_height="match_parent"
             android:layout_gravity="start">
 
diff --git a/app/src/main/res/layout/settings_fragment.xml b/app/src/main/res/layout/settings_fragment.xml
index 7f2bd98a7..95da87dbb 100644
--- a/app/src/main/res/layout/settings_fragment.xml
+++ b/app/src/main/res/layout/settings_fragment.xml
@@ -21,7 +21,7 @@
         tools:context=".MainActivity">
 
         <RelativeLayout
-            android:layout_width="280dp"
+            android:layout_width="@dimen/master_fragment_width"
             android:layout_height="match_parent"
             android:layout_gravity="start">
 
diff --git a/app/src/main/res/values-w1280dp/dimen.xml b/app/src/main/res/values-w1280dp/dimen.xml
new file mode 100644
index 000000000..13cfd12f7
--- /dev/null
+++ b/app/src/main/res/values-w1280dp/dimen.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="master_fragment_width">500dp</dimen>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-w600dp/dimen.xml b/app/src/main/res/values-w600dp/dimen.xml
new file mode 100644
index 000000000..da9bea704
--- /dev/null
+++ b/app/src/main/res/values-w600dp/dimen.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="master_fragment_width">300dp</dimen>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/dimen.xml b/app/src/main/res/values/dimen.xml
index 9344f15d7..ece5cbc65 100644
--- a/app/src/main/res/values/dimen.xml
+++ b/app/src/main/res/values/dimen.xml
@@ -38,4 +38,5 @@
     <dimen name="setting_subtitle_min_size">8sp</dimen>
     <dimen name="setting_subtitle_max_size">14sp</dimen>
     <dimen name="settings_granularity_step">1sp</dimen>
+    <dimen name="master_fragment_width">280dp</dimen>
 </resources>
\ No newline at end of file