Hello,
1) Yes, because you added 150px padding for the section https://prnt.sc/1qa2bf2 Edit your page and change the padding for the tablet resolution using Elementor settings https://prnt.sc/1qa2ko5 .
2) The same issue with padding here https://prnt.sc/1qa2dhs You set slide bg https://prnt.sc/1qa2hoo
3) Provide us with WP Dashboard access to check the issue with the menu in more detail.
Regards