Landscape Mode for Android

Pocketcloud Pro

Nexus 7 tablet (2013) - Android 4.4.2

Galaxy Note II phone - Android 4.3

Why doesn't screen rotation put Pocketcloud into landscape mode?

Screen rotation on the tablet works, but isn't true landscape mode, as less than 50 percent of screen is used, even smaller than portrait mode.

Screen rotation on the phone has no impact.

Don't anticipate using the phone except for emergencies, but would like portrait mode for the tablet.

I don't see any options to set.

Thanks