Photoshop Select/Marque Tool no longer shows outline whilst dragging/selecting

Thanks so much @J453 this seems to have worked.

Restore your preferences using this manual method:
https://helpx.adobe.com/photoshop/using/preferences.html#Manually
Does it work correctly?
If that doesn't solve it, you can quit Photoshop and put the Settings folder back.
If it does solve the problem, I would like to get the folder of settings to try and figure out what is bad with them.

You're most welcome!

I really don't know about macs, I guess people more in the know will chime in!
I know that on my end, I need to keep an eye on my nvidia updates, and there've been glitches (mostly in photoshop) for me, due to that fact.

Really appreciate the reply @Imaginerie.

When I press CONTROL/CMD+H my photoshop window is hidden, and I have to click the menu bar icon to bring it back 🤷🏼‍♂

I think you might be onto something WRT the "Graphics Processor Settings", this section is completely disabled for me...

I don't think there's anyway to update GC drivers on a MacBook is there? Its all delivered as part of the system updates.

Difficult to say but one thing first, check you didn't accidentally activated the CTRL/CMD+H shortcut.
It's a toggle command, meaning that pressing those keys again will re-instate the marching ants.
If this is not the issue,
Then you need to check your preferences (Edit>preferences>performance) and see if there is an issue with the Graphic card

It needs to show you're using your external GC, or whichever is appropriate)

I would also check for your graphic card updates, it can't hurt!