Mouse/Gamepad/Keyboard navigation in Main Menu

Hello,

I have the following problems:

When I hover mouse cursor over the button or click on the background, the button flickers. How do I fix that?

When navigating the main menu with the gamepad or keyboard, the button under the mouse cursor should no longer hover. As soon as I move the mouse, the button should hover under the mouse cursor again

That’s actually how it should work. But it doesn’t work

Widget Blueprint

Button Blueprint

Button Blueprint

Many thanks for the support in advance!