I remember a previous comment here on HN with a filter for ublock (or a similar blocker) that removes that suggestion box. I now use DDG but when I need to switch to Google you notice really quickly if the script is there or not.
! Hide the 'People also search for' slide-in box when going back on Google Search.
! We require the other attributes here to reduce the risk of false positives.
www.google.com#$#div[id^=eob_][jscontroller][jsdata][jsaction][data-ved] { display: none !important; }But there are free-form feedback fields all over nearly every Google product. Submitting feedback is generally very easy. E.g. on my phone, going to https://google.com -> scroll to the bottom of the page -> feedback link which gives me a text field. On search result pages I don't get a feedback link on mobile, but it's down there at the bottom on desktop.
The same is true on Gmail, Google play, YouTube, Drive, basically everything. In less common cases, it's on the first page of the "help" link. On mobile apps, it's often in the hamburger menu.