A follow up on this. When testing a related issue, I had no difficult simply closing the EGP, and it did not reopen when editing caption text in the Program Monitor. I can move the CTI, I can click on individual captions, and I can double click in the Program Monitor to edit. I can select captions in the Text Panel, I can double click captions in the Text Panel and edit. Nothing opens the EGP.
No idea what I am doing differently.
In my earlier tests, I closed the EGP and reopened. And reset the Workspace.