Problem with booting from external SSD

I have a bootable APFS volume on an external SSD, which is not the startup disk. It does not automatically show up in the volume selection screen so I update the profile to include it in the Volume section. The volume I need does show up, including the unwanted “- Data” volume, but after selecting the volume, the startup volume is booted instead with external SSD volume not now showing!

Help please.

After reading some topics, the problem is solved.

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