Really the only thing you have to do after installing Windows (if Linux was the first) is to reinstall your bootloader from a live Linux environment.
If it’s Grub, you can look here: https://pendrivelinux.com/restore-grub-after-windows-install/
If I’m right, during the restoration of the bootloader, Grub will find your Windows installation too, and will add it to the menu.
o1g