Hi @meardjer ,
Thank you for posting this topic in the Auth0 Community!
I observe the same as you when switching tenant in one window, the tenant in the other window gets updated.
How can I prevent this behavior, also is there a place to submit bugs in the Auth0 UI?
This topic explains how to submit Product Feedback or Feature Requests.
Meantime, I suggest you try this workaround, open one tenant in Chrome and open the other in Chrome incognito mode.
Hope this helps!