PDF Reader Pro enables you to change or lock the screen orientation when reading PDFs on your Android devices.
1. Open the file and enter the reading page;
2. Click More icon in the bottom right;
3. You can choose Auto Rotate, Follow System, Lock Screen under Rotation Setting.
Auto Rotate: Allows your device’s screen orientation to automatically adjust and rotate depending on how you are holding your device.
Follow System: Allows your device’s screen orientation to rotate following your system rotation setting.
Lock Screen: You can lock the screen orientation so that it doesn’t change when you rotate your device.