AOMEI Backupper - Why does it happen?

I installed AOMEI Backupper Standard on a newly-formatted Windows 8.1 system.
I created a System Backup and then, I Restored the System Backup image.

I noticed that AOMEI Backupper locks a Windows setting down!
This setting can be found on:

-Control Panel\All Control Panel Items\System
-Advanced System settings
-Advanced tab
-Startup and Recovery
-Settings... button.

Why does it happen?
Anyone noticed that?

I uninstalled AOMEI Backupper Standard
but the respective option still remains locked!

Is there a way I unlock the respective Windows option?

 

It is normal if you have one boot option only.

 

Before Restoring the AOMEI Backupper image
-even when taking the 1st BackUp-
the respective Windows setting 'Time to display recovery options when needed'
was unlocked (i.e. I could check/uncheck it and/or modify the amount of seconds).

After Restoring with AOMEI Backupper for the 1st time,
the respective Windows setting cannot be modified; it is locked!