No Okay (✓) button visible to save the password for ' password protect hidden item visibility ' when screen is rotated

Expected behavior

As to save pin password to protect hidden files from visibility, there should be a 'okay ' (✓) to proceed when screen is rotated

Actual behavior

The okay button (✓) to proceed is not visible when screen is rotated

How to reproduce

1. Download Simple File Manager from F-DROID
2. Open the app
3. Go to menu ( 3 dotted vertical line )
   
4. Go to settings
   
5. Go to security
   

Select the pin as your password

In portrait mode

When rotated

(✓) is not visible

• Browser: simple file manager 3.4.0
• Operating system:
  Android 8.1.0
• Model
  Pixel XL

Recording Of The Bug