I read about this on Wednesday, updated the app, and still no Experimental Features under settings. Updated the app again just now, still not there. I don't want to sign out and sign in again, because it says I will lose any Geocaching data saved on my device. Not the first time a new feature/change in the app (or a new cache for that matter) has not shown up until days, or even weeks, later than it has for some other cachers. Quite frustrating when one goes to an event, or caching with a group, and most people are having fun playing with a new feature, that a couple of you don't have, even though you have done updates/etc ...
Oh well ... hopefully it will show up for me by the time the current Covid Lockdown, for the area I live in, is lifted ... because this is a feature I would like to use ... although once I have filled my grid, then I also would then want the option to use it for a second loop, etc ...