Usage of Smart Dock

Hiding Android navigation buttons:
You should also hide the Android navigation buttons. There are several ways to do this
With root:
From Smart Dock advanced settings
Edit /system/build.prop and add qemu.hw.mainkeys=1
Run "echo qemu.hw.mainkeys=1 >> /system/build.prop"
Without root
Mount the system partition on Linux, edit /system/build.prop and add qemu.hw.mainkeys=1
For waydroid users, from Linux run waydroid prop set qemu.hw.mainkeys 1
With LSPosed (might help on Android 11+):
See LSPosed
The app uses an accessibility service to capture keyboard input, if that service is crashed you might need to re-enable it and/or restart the system.

Screenshots of SignalYou