There should be an option to change back to old Admin Center
Previously, I could change views, macros, triggers, etc. without a new tab opening up. Now, if I want to change a view it bounces me to the admin center, and then I have to open another new tab to go back to my regular instance to view the change. These unnecessary steps have made things more inconvenient than before.
If you'd like to keep your admin settings on the same tab, you can now use the free Admin Center app.