There is an issue on MIUI (Xiaomi devices), which by default blocks activities launched by the keyboard.
The consequence is that long press on 123 key to open the preferences doesn’t work, neither the voice input when clicking on the mic button.
The fix is to grant a specific permission to the app:
- Enter phone settings
- Apps > Manage Apps
- Select “Smart Keyboard Pro”
- Other authorizations
- Enable the Display pop-up windows while running in the background permission