Thanks for the screenshot, otherwise I would not have known the OS.
This is an OS issue: on the Mac, go into System Prefs and select Printers and Scanners. Click on the lock button (bottom left) with your sysem password unlock it. Then click on the item you wish to delete and then click on the minus icon (see arrow)
You "may" need to reboot to remove this from other application's awareness but I'm not sure on that. If you still see your scanners, than yes, you do need to reboot.
BTW, be aware that on the Mac, if you scan from within Acrobat, you are using Apple's Image Capture, the worst scanning software there is. And I'm a Mac user so this is not anything against Macs.

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