I know this is an old topic, but I couldn’t find an answer for this on the forums. As a note, for full UI scale one can use the following snippet (found one on the internet):
void UGameFunctionLibrary::UTIL_SetScaleUI(float Scale)
{
UUserInterfaceSettings* UISettings = GetMutableDefault<UUserInterfaceSettings>(UUserInterfaceSettings::StaticClass());
if (UISettings)
{
UISettings->ApplicationScale = Scale;
}
}