How to make grub remember last boot entry

[hachi]

I am on an EFI system, have Windows10 and CentOS
everything is fine, but I would like that grub remembers the last boot,
since I am not that often in Windows, and if, it updates and requires restarts that take time and where I would like to go away from the computer
for this it would be nice to again boot into Windows

I edited /boot/grub2/grub.cfg
and added
GRUB_SAVEDEFAULT=true

then I run

grub2-mkconfig

but this did not change anything

what do I miss?

Thanks for help!

[hachi]

found the solution/explaination: https://fedoraproject.org/wiki/GRUB_2

(it there a way to makr threads as solved?)