I am using ArcMap 10.7 and very often I export data from attribute tables to external Excel files.
Very recently I saw several table layers appearing on my map (figure below) and I guess this was caused by some accidental uses of Ctrl+C and/or Ctrl+V. However, I do not know how to remove them! It does not help to close all the layers, and they remain there even when I close and reopen this .mxd file. It seems weird to have tables on a map!
You can see the sketch of tables in the center, at the west coasts of Africa:
As I zoom in, you can see that there are actually multiple overlapping table layers!