CallInEditor Functions Do Not Trigger When Used in ProjectSettings (UDeveloperSettings)

General Feedback & Requests
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1

Summary

When using UFUNCTION(CallInEditor) on a function inside a class derived from UDeveloperSettings, the corresponding button appears in the Project Settings UI. However, clicking the button does not actually call the function — no log output, no breakpoint hit, and no runtime behavior occurs.

Reproduction Steps

  1. Create a class derived from UDeveloperSettings.
  2. Add a function marked with UFUNCTION(CallInEditor).
  3. Open the Project Settings and locate the button corresponding to that function.
  4. Click the button.

Expected Result

The function should be executed when the button is clicked, as it works with AActor and UActorComponent classes.

Actual Result

Nothing happens. The function is never triggered.

Notes

  • The button is rendered correctly in the Project Settings panel.
  • No log or trace of the function execution is observed.
  • This might be due to UDeveloperSettings not being instantiated in a way that supports CallInEditor.

Request

If this is not a bug but an intentional limitation, please clarify in the documentation. Otherwise, it would be helpful to support CallInEditor inside UDeveloperSettings, as it allows for more convenient editor tooling.

Example Code

UCLASS(config=Game, defaultconfig)
class UMyProjectSettings : public UDeveloperSettings
{
    GENERATED_BODY()

public:
    UFUNCTION(CallInEditor, Category="Test")
    void DoSomething();

};

void UMyProjectSettings::DoSomething()
{
    UE_LOG(LogTemp, Warning, TEXT("DoSomething() was called."));
}
2

While exploring alternatives to using CallInEditor, I was able to achieve it using the following method.

  1. Create a class that inherits from IDetailCustomization
  2. In the CustomizeDetails method, use AddCustomRow to add a custom row
  3. Place an SButton widget and specify an event handler in OnClicked
  4. In the event handler, return FReply::Handled()
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