After Android 10 update Oxygen OS 10 most Oneplus user have been reporting issues about Large empty black/white space below keyboard.
Above Image is from the latest OXYGEN OS 10.3.1. This issue can be easily Fixed by ADB with a simple command until Oneplus Rolls out an fix to it.
1.A Windows PC.
3.Oneplus Device Running Android 10.
Follow Below Guide :
1.Download ADB Drivers.
2.Install .Exe file and Follow the Screen guide.
3.Now ADB drivers are Install Successfully.
4.After ADB drivers are Installed a new Folder will be created in C Drive.
5.Open ADB folder and open command Prompt by typing CMD in the address bar.
6.Command Prompt will pop up.
7.Now Connect Deve to Check if Device is properly Connected in Fastboot mode by Using below Command.
8.If Device is properly Connect you can see Serial number of you device under list of Device Attached.
9.Now we need to use the command to Remove Dead Space under the Keyboard.
10.Enjoy Keyboard like Android 9.
11.If you want Default Keyboard , Use below Command.
Video Guide : Fix Dead Space under Keyboard Oxygen OS 10.3.1.