Don't see windows in GRUB

[TriMoon]

Hi and welcome to the forum

@Mikayelb

It seems like I messed up cause I installed manjaro in UEFI mode so now my grub doesn’t see windows (which is as far as I understand using BIOS) and only boots to Manjaro (according to other forum posts here)

You probably just don’t get to see the menu of grub to choose your M$.
Just press and hold any letter key while booting to see it…

Related: GRUB Menu Not Showing On Boot, Boots into Default Kernel Instead