I needed Landscape mode for text-editing software and notetaking software with mainly an external keyboard as input. I didn't find any settings for that, but i found a cheap app (2;39 €) Rotation Control Pro:
https://play.google.com/store/apps/d...ntrolpro&hl=en
With this app one can force , App per App, to switch in Landsacpe mode or reversed Landscape Mode. It works fine with Google Keep and Dayone for exemple. No i can put the Mimas in Landscape mode in a Tablet stand and have the full width and more stability. Also, the on screen keyboard is larger, that's a positive side effect if you use it on your lap.
I switched "background mode enabled" and "launch on startup" on for this in the settings "Snowflake" on the App-Homescreen,
and inside the app i sais "reversed landscape" for Dayone, Google Keep and so on.
You also have to change the detection mode "App per App" to "User access".
Then it works great.
Only hope that the bacground activity won't take tomuch battery.