Won't let me customize toolbar in to add "Advanced Settings" in printer preferences
I need to add a printer, and I can't do it without the Advanced Settings in the Printers & Scanners preferences. Strangely, though, I can't access the Advanced Settings because the computer won't let me add it to the Toolbar. I can open "Customize Toolbar," but it won't let me customize it. I drag Advanced Settings down, but it won't stick.
Please help!
MacBook Air 13″, macOS 11.5