Main Menu Widget won't disappear When opening another level

I made this simple main menu widget I want the widget to disappear when i click the start button, but it seems that the widget disappears and appears again after the new level have started, but all the other functions work normally and the game fully playable.
Can any one explain whats wrong with the command in photo below?

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I think rather than setting the widget to hidden, how about using RemoveFromParent?