How can immutable Fedora be used in dual boot? (other systems are later installed? - a new drive with them added back later?)

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Thanks to your answer I went forward with the Kionite installation, which went smoothly after taking THIS advice too.

I have created 3 partitions, as said there:

  1. one/boot, ext4, 1 GiB
  2. one boot/uefi, 500-600 MB
  3. one / (root), much larger

After first update and reboot the Fedora boot list showed all the other installed operating systems.

I’ll mark your answer as the solution.