I am following a tutorial from Epic and stuck with replacing the Game mode

Development Programming & Scripting
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6

To fix the issue with your BP_AdventureGameMode not showing up in Project Settings:

  1. Open the Blueprint and click Compile to ensure no errors.
  2. Check that it inherits from your C++ GameMode, not GameModeBase.
  3. Right-click the folder it’s in and choose “Fix Redirectors”.
  4. If still broken, close UE, delete Binaries, Saved, and Intermediate, then regenerate project files.

This usually resolves the dropdown issue in UE 5.6.