Firstly i would like to say that im pretty sure that this question was asked many times before, but sadly i could find previous answers, so just linking another forums post is very appreciated too!
Like ~1 year ago i fully wiped my laptop and started over with manjaro as my main (and the only) OS, and its awesome! But as with any linux distro, games are supported very barely, driver support is too low (even for ubuntu-based distros) and im a bit bored by playing only a few java games with 30 fps (while on windows they were at 60 always, likely driver issue). I decided to install windows as a second OS, for games, but heard somewhere that windows doesnt care about grub and linux overall and stupidly replaces grub boot point with Windows boot loader. If that’s true, any way to safely install windows without removing grub boot entry?
And no, i didn’t choose manjaro because thought that “its popular and fast i will play games there go brr”, i mainly develop software and game mods on it, playing games is more like a hobby.
If your computer uses UEFI, grub is not going to be overwrited or deleted. But Windows will put it’s bootloader first in the UEFI list (Manjaro does the same when installing ). So you only need to change the default boot entry in UEFI’s boot settings.