How to link newer version of XQuartz to terminal

In X, the server usually has the display, and the apps are the clients and the clients can be local or remote.

ssh -Y shuts off connection security, and should only be used with remote systems that are entirely trusten.

Usual path is to launch the X Window Server (launch the X11 / XQuartz app), launch XTerm, and ssh -X or ssh -Y or other such from within XTerm to the remote host that will run the X client app., and run the X app. Maybe launch xclock as a test on the X client host.

In the case of ssh -X and ssh -Y, the network connection is routed through the ssh tunnel, so you get whatever is running locally on the X Window System server; whatever is running XTerm ssh on XQuartz, in this case.

If you have two X servers around, yeah, that can (might) get tangled. Remove one, or don’t start one.

Now…

What are the (presumably) X-related error messages shown, if any?

One app is not displaying correctly? Other apps are working? Any pattern to the working and non-working apps?

Are any if the apps involved expecting Wayland, maybe?

XQuartz 2.8.5 is the current version for macOS 10.9 or later.

It replaces deprecated X11.