Linux Mastering Development

UEFI only recognizes /dev/sda, but not /dev/sda2, as bootable

I have two bootable partitions, /dev/sda and /dev/sda2. However, when I restart my PC the UEFI bootsystem only recognizes the /dev/sda partition.

How do I fix this? I set the boot and esp flags to /dev/sda2, which contains a Manjaro ISO. /dev/sda contains a Solus ISO. I’m using the UEFI bootsystem, NOT Legacy boot. How can I set it to recognize /dev/sda2 rather than /dev/sda?

Here is an image if it will better articulate what I’m trying to type.

Partition layout

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