Editor - App doesn't change its theme.

Editor

Project Information
• Repository : https://github.com/billthefarmer/editor
• Project Name : Editor

Expected Behavior
The app should have changed the theme on any screen orientations.

Actual Behavior
But the app doesn't change the theme until we rotate the app.

How to reproduce

1. First download the app from F-Droid.
2. Launch the app.
3. Tap the three dots on the top right side.
4. Tap on the theme and select any one of the theme.
5. But the theme doesn't change. We need to rotate the app to apply the theme which means the app isn't stable at all.

• App Version : 1.20
• Operating System : Android 6.0
• Decice : Lava Iris 50

Recording of the bug