By using the right arrow key, you can invisibly select an element that can be renamed (?) by pressing F2. Here’s what I mean:
https://i.gyazo.com/7addc0b22682ba17472f35c51477087c.mp4
After the invisible element (the + button?) is renamed, the + button that initiates the insert-object context menu no longer pops up.
I discovered this as I use F2 to rename instances a lot, and somehow I managed to press the right arrow key between selecting the object, and pressing F2.
This works for any object that is not collapsible, as the right arrow key uncollapses the hierarchy in that case.
