Dual booting Windows 11 after installing Manjaro KDE-Plasma

[cscs]

@bhargavdabear

boot-menu won’t detect my USB

You probably need to resolve this first… there are tutorials available such as this one:

[root tip] [How To] Use Manjaro to create a bootable Windows USB

Creating a bootable USB from a Windows ISO The reason for needing this could be e.g. reinstalling Windows but it could also be to update your system firmware - because the vendor only provided Windows binaries - you need a Windows system. To update you system firmware you can use a Windows PE environment like Hiren’s BootCD Hirens BootCD If you want to reinstall Windows after your Manjaro adventure get a Windows ISO from Microsoft Topics covered Using woeusb Using ventoy Using terminal W…

@bhargavdabear

any way to either dual boot and install windows again after having manjaro on the whole drive or can I uninstall manjaro as a whole and install windows again?

Of course you can uninstall or overwrite the whole thing.
You can also partition the drive into the 2 OSs.
Do be warned: Resizing a partition with data on it always runs the risk of corruption.