I was after an app that would force all apps to work in landscape and this does just that, it was though removed from the Play Store but available at APK Pure. This is a simple, straightforward and free app.
Alternatively, Rotate Screen Orientation is on the Play Store albeit, a paid app for the same features. Worth mentioning, there are times when Rotate Screeb Orientation goes free for a limited time, so there's that.
P.S. You can use this on a phone but it's optimized for bigger screens, that is, tablets of 8" or larger and on small screens of phones with 5" or less it can run into issues (app crashes).
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Chief Bargain Hunter