Why it is so bad?
I hovered button and here is the result. I’ve just set my mouse on the button for a while.
Firstly, I tried to use group and hide it when hovered, but it was very awful, on the video it is shape.
Hey there 
So when you use a conditional to hide something on hover it will do an endless loop. This is what is happening:
Element 1 is hovered then hide Element 1.
Element 1 becomes not hovered because it is hidden, causing it to un hide.
Then repeats because it is hovered Element 1 will hide again.
Repeat again and again.
If you really need to hide something on hover you can always put the condition on both elements by saying:
If Element 1 is hovered or Element 2 (The element underneath) is hovered then hide Element 1.
I hope that makes sense.
Hope that helps! 
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