Grub hide option

[sajjad000]

Please add an option to hide the grub menu on startup because I want deepin to be default without seeing the grub menu

[BLumia]

cc @meiyixiang

[raspin0]

There's an option to reduce waiting time from 5 to 1 second. You can install Grub Customizer from the App Store to remove delay entirely, however if your system breaks you might have a hard time to fixing it and entering grub.