Ok, This was interesting: I tried the Activity graph, and found that yes, indeed, I could drop that. Then I was asked to select something from a dropdown box, but my MacBook Pro (Safari) does not give me any chance to open the dropdown box to select something different. I am going to try it on another computer with a different browser tonight.
As for the iPad, I have never set my RA log settings with it, but I find that I frequently seem to accidentally rearrange the tiles or else to eliminate tiles without intention to do so.