peter Landscape and Portrait can have different sidebar widths. They remember the last width you have set for that orientation.
But you are right, if mixer and sidebar are both open in landscape, one of those needs to close when rotated to portrait.
I like all six view options, for different reasons, depending if I’m running stereo only, or multitrack to stereo out or multitrack to multitrack out.
Stereo only , in landscape having mixer in lyrics area only is fine as you see everything in mixer and you get long view of song selection area.The mixer is small.
In Portrait same applies.
In multitrack stereo out, again in landscape option 1 is preferred,
But in portrait mode I might prefer to see lyrics only with full mixer width on iPhone but on iPad I might still be happy with option 1.
When using multitrack and outputting to multitrack buses, when I open mixer In landscape I want to see full width mixer and small song selection with lyrics or only lyrics on top as the mixer is most important at that time and the more I see of it the better .The mixer is large.
In portrait mode again the mixer view choice to be full width of screen with choice of which view on top most important to the user.
Once you make your view choices to suit your operational needs depending on device you are using and output mode these views become your default options and always behave the same when you open and close the mixer.
At the moment if I have my preferred way of working and I open the mixer it defaults to another view I don’t use and then have to recreate the view I need , this is not ideal when on stage and quickly needing to use the mixer.
I haven’t used this on stage yet so I am theorising only.