A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Either, while on the sheet, press F5 on the keyboard and choose Special…, then Objects, OK
or select a big area with a marquis (mentioned earlier) (click and drag while you've opted for Select Objects). If there are many objects on top of each other, all of them will be selected.
or show the selection pane, and select objects in there one at a time while holding the control key (probably best to use this to deselect objects you don't want to lose, some dropdown arrows sometimes get included as objects)
After one of those processes, press the delete key on the keyboard.