SQL Sentry Plan Explorer currently does not support SQL Server Management Studio 19.x

Same problem here. SSMS 19.X is not supported. Microsoft implemented some braking changes in SSMS 19 Preview 4, so older add-in versions cannot register anymore. Red-Gate had the same problems but was faster in fixing SQL Prompt et al.

Since Plan Explorer's last update was in July 2021, it seems that there is not much love for it at Solarwinds. We are still loving it as users, but …

Same problem here. SSMS 19.X is not supported. Microsoft implemented some braking changes in SSMS 19 Preview 4, so older add-in versions cannot register anymore. Red-Gate had the same problems but was faster in fixing SQL Prompt et al.

Since Plan Explorer's last update was in July 2021, it seems that there is not much love for it at Solarwinds. We are still loving it as users, but …

There is still plenty of love for Plan Explorer here at SolarWinds.  While we haven't made as much progress as we would have liked with it recently, we are collecting feedback from the community on ways to enhance it and I'm hoping that we'll have some additions here in 2023.