I know this discussion has been years, but I had the same issue and after reading different discussions and adobe-related forums, I haven't found any answer, but I've figured out a solution that worked at least for me.
Go to "Edit" > "Preferences" > "General" tab > click on the "Touch Mode" drop-down menu and select "Auto-Detect" as well as with "Scale for screen resolution (restart required)" option.
Click "OK" and restart (close and open) Adobe reader.
Now try the read-mode "Ctrl+H" and it should work as it's supposed to instead of being full-screen.
I know this discussion has been years, but I had the same issue and after reading different discussions and adobe-related forums, I haven't found any answer, but I've figured out a solution that worked at least for me.
Go to "Edit" > "Preferences" > "General" tab > click on the "Touch Mode" drop-down menu and select "Auto-Detect" as well as with "Scale for screen resolution (restart required)" option.
Click "OK" and restart (close and open) Adobe reader.
Now try the read-mode "Ctrl+H" and it should work as it's supposed to instead of being full-screen.