This Slack is still using the old version (layout). Is this due to a gradual rollout, or is this controlled by admins somehow?

Hopefully, someone just doesn't like that usability downgrade. :-D

I don't care too much about the upgrade itself, but I'm very bothered by the switch from one version to the other (as I alternate a lot between different slack workspaces)

It's a staged rollout by workspace, admins don't control this.

Ok thanks. Then I'll just patiently wait 😉

Thank god