mdadm raid 10 added to fstab shows as removable drive in dolphin. How to fix?

I'm still relatively inexperienced in Linux and this is my first post here. I configured mdadm raid 10 far acording to archlinux RAID wiki page but with custom chunk size 64K. It contains 2 older identical hdds intended for use as data (documents, music, photo, movies, conf. backup and so on). I formated this raid to ext4 and added raid's filesystem UUID to fstab and mounted it as /home/dmk/data. Then I chown 1000:1000 the mountpoint. I'm on opensuse tumbleweed with KDE. In dolphin this data raid volume shows as removable, which is not desirable because I want to redirect user directories to my data raid and don't want an accidental disconnection when system runs. But in KDE plasma system tray, disk and devices, there is no removable device listed. Maybe it's only dolphin bug or what. So, I want to get rid of this remove option. I was looking in the dolphin settings with no luck, otherwise I think it's a linux issue. Can you please help me find a way to fix it and find a cause of this behavior? Edit: I have linux on 60G partition of 480G intel ssd and I formatted the rest of drive as data fast partition mainly for steam game data. This partition correctly shows in Dolphin as non removable. Edit 2: Here is my fstab:

UUID=a08f9faa-8142-415c-9ed7-6705237012b1  /                       ext4  defaults      0  1
UUID=b7d0abb1-cf05-45a7-ad4b-2ad4e3a68924  /boot                   ext4  data=ordered  0  2
UUID=84a98554-62fa-4582-b7d6-87a7ccd29ae7  /home/dmk/data\040fast  ext4  data=ordered  0  2
UUID=9d9edf73-fd37-49c9-aa3c-644113183558  /home/dmk/data          ext4  data=ordered  0  2