Format and reinstall Windows 10, will break my GRUB?

Hi guys, I have a question here. Thanks for read! :slight_smile:

I have in dualboot Manjaro and Windows 10. I want to format Windows 10 and reinstall. This action will break my GRUB?
My PC had Windows 10 first and then I installed Manjaro, in that order.

If Grub will break, what is the next step to repair it?

Thanks again for your time!

Windows will overwrite GRUB in the process, yes. You can restore it afterwards: