Quote:
Originally Posted by RowdyRuff
With a book open, bring up the menu options and you can see an icon at the top that looks like a jauntily-positioned smartphone with arrow indicators around it; you're options will pop up if you tap the icon.
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Thanks for your help, although I found the option, and portrait mode with a padlock is selected, it still flips in portrait mode.
That option in my case, it seems that only serves to lock the screen rotation in a mode, but does not prevent it from staying in the position that interests me.
https://imgur.com/a/fMTPX11