my understanding of TOR is that you have to permit yourself to be a routable node on the network - have you been, and you now wish to undo that?
(I use a browser - brave - that has Tor functionality built-in, and our Merlin-flashed routers have the capability to turn themselves into a Tor node IIRC...I've never tried. I'm much more interested in IPFS)
It's probably a good idea to log into the GUI of the router and check Advanced Settngs - VPN - TOR and select Disable if it is currently set to Enable and then hit apply.
Be prepared for some users to be upset if this breaks things for them.
HTH...but you really should use Tor for obfuscation/pseudonymity on the net. (or have they been hacked somehow recently? compromised by one of the letter agencies?)
EDIT- if you're using default login/pwd to the router and someone on your network has enabled Tor functionality in spite of your wishes, you should change things up and keep them private. If it's blocking users on your network from using Tor that you're looking to accomplish, I'm pretty sure the only way to do that is to deny them access to the network with credentials or by restricting device usage (if you're a parent concerned with your child's browsing, which is likely the case with CleanBrowsing DNS...)