Please help with when changing from desktop to mobile view

Hello. I have problem with the mobile view .
Everything I designed on the desktop page crashes when it turns to single columned on mobile view. (the header menu doesn’t fit on the mobile rectangle single column)
ALSO** how to do accordion menu header?
I tried the css method it did not work…

The menu header doesn’t fit on single column it just gets cut off
I really appreciate your help Thank you!

mobile view:

Screen Shot 2024-04-23 at 1.23.52 PM

below image is the header of the desktop :