It took me a while to figure this out. I always had Windows Boot Manager on my grub menu, but when I added a theme. It disappeared.
To fix this:
In the terminal
sudo os-prober #if it detects it then run
update-grub
if update-grub isn't found. Just install it
sudo pacman -S update-grub
yay -S update-grub
I got a warning that os-prober won't detect it when I ran the command.
I would go to
/etc/default/grub (this is a file) you need to edit it
GRUB_DISABLE_OS_PROBER=false
just uncomment it and save.
Try again.
It should work now.
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