So many have complained about this since it was introduced, and for a very good reason. I’ve been using it constantly every day since it came out in whatever version a few years ago and I still enable loop by accident very often, as does anyone from other DAWs who uses Cubase here. Please, please, please let the us, as an option, make the top of the ruler not turn the pointer into loop enable/disable – cumulatively it adds a lot of wasted mousing every day. It really does get in the way for many in its current form.
Simply make it an option in preferences. Done, and everyone is happy.