Some apps have a nasty habit of ignoring your Android's auto-rotation settings and locking the display into either portrait or landscape orientation.
When you open one of these apps, the screen goes into landscape view and you're forced to hold your phone differently. Conversely, other apps use portrait mode only, so you couldn't flip it sideways even if you wanted to (I'm looking at you, Instagram).
Luckily, developer defim isn't very fond of this practice either. His latest Xposed module enables auto-rotation on every app installed on your device, leaving the decision up to you as to which orientation to use.
If you're tired of apps preventing you from rotating your screen, head to the Download section of your Xposed Installer app and search HaveOwnOrientation, then tap the top result.
From here, swipe over to the Versions tab, then tap the Download button on the most recent entry.
After a few seconds, Android's installer interface should come right up. When it does, simply tap the Install button.
No matter how you installed the mod, you'll get a notification from Xposed telling you that the module hasn't been activated yet and that a reboot is needed. Just tap the Activate and reboot button on this notification, and Xposed will handle the rest for you automatically.
Once you get back up, no further setup is required. Apps like Instagram that were previously locked into portrait mode will now allow you to rotate them to landscape mode.
The same goes for apps that used to be locked down to landscape mode. Hold your phone vertically, and they'll be shown in portrait mode.