After updating to Android Studio Arctic Fox, I cannot use any custom theme

by

Follow Simple Steps to Fix this

  1. Rename the {path-of-android-studio}/lib/gson-2.7.jar file to gson-2.7.jar.disabled.
  2. Restart Studio.

where {path-of-android-studio} is by default C:\Program Files\Android\Android Studio on Windows and /Applications/Android Studio.app/Contents on Mac.

The fix will be included in the next minor release of the 2020.3.1 Arctic Fox.

Found From issue-tracker

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