Arch Linux: Windows OS not apearing in Grub boot loader.

As I have installed Endeavour Linux operating system, on first boot I could see Windows OS option in boot menu. Later its gone. After searching a while, I came across below solution which worked.

Main reason is the os-prober is disabled by default so it wont be able to detect other OS available in the same system. So first we have to enable it.

Open file `/etc/default/grub` and add `GRUB_DISABLE_OS_PROBER=false` to the very end of the file. If you have already have this property, set it to `true`.

You can also execute below command, make sure you are in root shell or sudo user to execute this command.

echo "GRUB_DISABLE_OS_PROBER=false" >> /etc/default/grub

Then, execute below commands

sudo pacman -Syu
sudo pacman -S grub-tools
sudo pacman -S grub os-prober
sudo grub-mkconfig -o /boot/grub/grub.cfg

Actually if you `os-prober` command you can see the output that Windows detected right away

[agastya@agastya-thinkpad ~]$  sudo os-prober 
/dev/nvme0n1p1@/efi/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
[agastya@agastya-thinkpad ~]$ 

Once grub configuration generated, restart your machine and you can see Windows in the grub menu.

Thank you.
Hope it helps.