On Wed, Jul 10, 2019, 9:04 PM sixpack13 <sixpack13@online.de> wrote:
wasn't su disallowed during the last fedora upgrades ?

No.
As farĀ as I know only root is locked by default (at least on Fedora Workstation). Aka you can't su to root. But you are able to use Switch to any other (not locked) User, as usual.

Greetings
A.