I cannot add frames to the scene

I’ve been using Harmony 17 for about a year now. Currently I am using it on a macOS Catalina. Right now I am having trouble adding frames

When I go to “Scene” the options to add or subtract frames are all grayed out. I have tried selecting from X-sheet, and layers and I don’t really understand why this is happening as this has never been a problem before

Any help would be greatly appreciated