To disable AI content clutter (copilot answers, video results, similar content and related searches) on Bing searches you can add a small rule to uBlock Origin extension under "My Filters" section:
www.bing.com##.b_ans
This will obviously break as soon as Microsoft pushes any update that changes the page content setup, however the workaround will be the same and will simply require finding out which element(s) to block.
uBlock Origin also has a very handy element picker mode that allows selecting a page component to create a rule to block it. Naturally the same can be achieved also by inspecting the page with Developer Tools (F12 usually) and finding the element tag(s) to block.