this will be a short one but it is quite annoying one: Google Chrome keeps making Lens as default image search in Chrome after every few updates (not often). It is used when you right click an image on internet and select “Search image with Google”. Here is how to turn lens off:
Open a new tab and go to chrome://flags.
Search and locate the following flag: Enable Lens features in Chrome. From the drop-down, select Disabled
You need to relaunch Chrome and problem solved.