Well, the upgrade wasn’t too painful. I had to make sure my battery was at 90% and I had to remove one item the installer found objectionable ( gcc-7-base(7.5.0-5) ) and then it let me start it.
After the upgrade, the settings screen for Display was certainly different. I like to use my docking device sitting at my desk. It took a few tries but I managed to get the desktop displayed on my monitor.
Several apps would not display on the screen. I get a white monitor and it comes up on my L5 screen.
Calendar
both File Browsers
Firefox ESR
Geary
gEdit
Aisle Riot
Lollypop
PureOS store ( which I looked at in hopes of updates to fix this issue, none yet )
Settings
Contacts
Many came up on the main screen, which is encouraging.
Gapless ( which I did not have before ), Bluesky ( a shortcut I made? ), Weather and Weather Underground, Tuba, Usage, VLC, Text Editor, Clementine, Shortwave, Image Viewer, Iotas, L5 Tour, MPV Media, Secrets ( password vault app ), Chromium, Console ( thank goodness )
ReText would not load at all. Can’t remember the last time I used it.