I made a new project using an older project (to keep all my preferences)
Imported Tempo Track in it with a dumb video for sound.
I got too many bars and tried to delete them using the Popover “Trim”
or Write menu / Trim Flow without success.
I had to use System Track to erase the bars.
There are a lot of automation and tempo events in the flow, so Dorico won’t trim the flow to delete them. You can delete them all using the new command Play > Automation > Delete All Automation, and then when you trim the flow it will be trimmed back to bar 96.