2fa and admin functionality

Before enabling 2fa, as admin, i could open a window/page for my site and clicking on any link in the admin panel on the left, would take me to another window where i could open and edit the other/next page, having multiple tabs open with different pages to edit.
After enabling 2fa, i can only open one tab as admin and edit that one page… opening any pages thereafter just takes me to the regular page as a visitor, with no admin functionality… is there an option to allow me to have multiple pages open to edit at the same time?

The page I need help with: [log in to see the link]