Only cubes as boot option on boot

[apparatus]

@aur99

Why don’t my other OS don’t show up in the boot menu?

You mean from Qubes OS GRUB menu?
By default only Qubes OS is present in your GRUB config. If you want to add your other OS to the Qubes OS GRUB menu then you need to do it manually.
Or you can use UEFI to boot your OS from another drive instead of using Qubes OS GRUB menu.

Multibooting Qubes

Introduction You should think carefully before dual booting Qubes on your box. Read the guidelines carefully. One problem is that when you dual or multiboot, even if you are using encryption on your Qubes installation, /boot is still unprotected and could be maliciously modified by the other OS, possibly leading to Qubes itself being maliciously modified. The other problem is firmware security - for example the other system could infect the BIOS firmware, which might enable compromise or spyi…

@aur99

And my boot menu is all black/white unlike what I saw on boot on other people’s install.

I think black/white is on UEFI systems and colored is on Legacy BIOS systems. Or was it the other way around? In any case it shouldn’t matter.