I just posted about this issue at the following link.
https://forums.sonarr.tv/t/sonarr-v3-installed-but-showing-v2-ui/20636
Read my reply to markus, I had the same issue.
I just posted about this issue at the following link.
https://forums.sonarr.tv/t/sonarr-v3-installed-but-showing-v2-ui/20636
Read my reply to markus, I had the same issue.