Closing since #2469 was merged.
@DevynCJohnson for your specific widgets the names are, respectively: * notebook1 * notebook3 * notebook_info * menu_project1_menu
The names come from [the Glade file](https://github.com/geany/geany/blob/2b6d5956eb5b3f17a2f15889a8bea1271cedce1b...) and are obviously terrible. Future PRs to fix any/all of the names in the Glade file and code would be most welcome.