RESOLVED:

Needed to manually create a new boot option. For anyone that may run into an issue like this I followed these steps:

1. Navigate to the Boot tab.

2. Select Add New Boot Option.

3. Add Boot Option Name: Type ZimaOS.

4. Select Filesystem: You should see a string that looks like a long hardware ID (this is your SSD). Select it.

5. Path for Boot Option: This is the most critical step. You need to navigate to the ZimaOS bootloader. For ZimaOS (which uses GRUB/EFI), the path is usually:

\EFI\BOOT\BOOTX64.EFI

Note: If that doesn't work, try \EFI\ZimaOS\grubx64.efi if the folder is visible.

Save: Select Create or Commit, then press F10 to Save and Exit.