Google is testing a magnifying glass in the mobile search at footer overlay on the bottom right. You can see this when you can scroll down in mobile search. You can use this to refine your search.

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Google is Testing Local Panel Layouts on Mobile Search

This was spotted by Vlad Rapp0port & shared over Twitter:

Here is the Tweet Mentioned:

Google testing corner placement of a magnifying glass in the SERPs. Pressing on simply let’s you modify your search query. Is this new? @rustybrick pic.twitter.com/E059iWOOlz

— Vlad Rappoport (@vladrpt) June 6, 2021

Google also tested to remove magnifying glass from desktop search recently.