Scroll to top don't work, it scrolls down too

Hello,

I have a problem. When I activate “scroll to top” option it scrolls to the top of content and I would like it scrolls to the menu or to the high top of my website. What can I do to set this ?

Something else, when I click on a page in my menu, it scrolls down, under the menu. How can I disable scroll down ?

Thanks foryour help

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