I have and use KDE as my main DE. However I installed gnome to a seperate partition and it is not shown at boot and I cant see it as an option. I can see it is on the disk but no boot to it. The install went normal with no issues. How can I get to gnome? It did share the boot and swap partition but the gnome is on its own partition.
Welcome to the forum! 
My educated guess would be that you installed one system in native UEFI mode and the other in legacy BIOS compatibility mode. That won’t work ─ both systems must be installed in the same manner. And considering that this is 2021, I would recommend installing them in native UEFI mode, with a common EFI system partition.
Do however keep in mind that the GRUB of the system you installed last will be the one that’s in control.
1 Like
Thanks for the quick reply. They are both installed in the same manner. I am aware that sometimes manjaro doesnt play nice with others at boot. However I also have other distros installed as well and no issues with them. The only problem is recognizing 2 manjaros installed.