Unable to select multiple components with drag or command+

Very new to Retool, so bare with me!
I'm trying to select multiple components to turn them into a module so I can reuse it in several apps (for a left-pane nav menu).

When I drag to select multiple or try to command + click on multiple, it's not selecting those components the way I see it being done here.

Any reason why certain components wouldn't be 'selectable' ?

Thanks in advance!