Mass actions allow you to gain time when navigating on your 3D guidelines. The “Remove Notes, reduce/expand notes, and remove new tags” buttons will delete elements in bulk. You can multi-select to target your actions.
If none are specified, all of that element will be removed from the guideline.
The button "remove rulers" will also remove every ruler in the scene.
To find these options open your 3D editor, and open the "Display" tab:
Please note: if you accidentally remove elements, you can simply undo in the top left corner!