I think I accidentally found the problem.
As for as which builder…..I have the Expand All function (Is that the Responsive Builder?)
Anyway, there was an invisible list on the page that I could not select (even with a selection widow). I accidentally saw it after a button dissapeared, then selected the back button on the components menu…..and it highlighted the list.
I deleted the list and am now able to do what I wanted to do.
Thanks for sticking in it with me @Dilon