Hi,
I've done a fresh install of Fedora 36 (Cinnamon) where there are 2 mounts:
/dev/mapper/vgroot-root / ext4 defaults 1 1
/dev/mapper/vgdata-data /home/myuser/Data ext4 defaults 1 2
/ is on a single NVME SSD while /home/myuser/Data is on a pair of 2.5" HDD repurposed from portable drives (both Seagate ST2000LM007-1R8174) into 1 volume group.
The mountpoint /home/myuser/Data is recognised as a removable drive by the O/S (removable drive icon in panel) and by Nemo.
On my previous Fedora 35 also Cinnamon (in place upgrades from about Fedora 32 I think), I had the same set up except both HDD were 3.5". And the same mountpoint doesn't show up as removable media.
Closest Google-fu got me was ...
https://forums.linuxmint.com/viewtopic.php?t=329981
... where the advice was to mount in either /mnt or /media which will prevent the HDD was being seen as removable media.
I'm obviously not up to speed as to what is considered removable media by the O/S. Any advice would be most appreciated.