Unable to find which files are consuming disk space in root partition

Question

When I try to display file usage on the root partition using an application like FileLight, it gives me this output:

However, I see different total usage in the Dolphin File Manager.

I got to see the same in the KDE partition manager and Gparted.

I am also sharing the output of the df -hs /* command. In the output, I see that the root and the home partition altogether consume around 45 GB s.

0       /afs
4.0K    /bin
455M    /boot
1.1M    /dev
42M     /etc
9.5G    /home
4.0K    /lib
4.0K    /lib64
0       /lost+found
191G    /media
0       /mnt
2.3G    /opt
du: cannot read directory '/proc/4632/task/4632/net': Invalid argument
du: cannot read directory '/proc/4632/net': Invalid argument
du: cannot access '/proc/13575/task/13575/fd/4': No such file or directory
du: cannot access '/proc/13575/task/13575/fdinfo/4': No such file or directory
du: cannot access '/proc/13575/fd/3': No such file or directory
du: cannot access '/proc/13575/fdinfo/3': No such file or directory
0       /proc
135M    /root
du: cannot access '/run/user/1000/doc': Permission denied
76G     /run
4.0K    /sbin
0       /srv
0       /sys
du: cannot access '/tmp/.mount_jetbrad4Z7Cb': Permission denied
52K     /tmp
17G     /usr
12G     /var

Please note that mount points of other hard drive partitions and Windows installation partition are mounted in the /media directory and the /run directory. That's why they are showing this usage.

Is there any other way to see what actually is consuming disk space in the root partition? I am seeking help for this.

Filesystem: btrfs. Compare to btrfs: browsing subvolumes, read my answer there. The point: "you should mount the root of your Btrfs filesystem somewhere, with subvol=/ option. This way you gain access to the filesystem in its entirety". Then you analyze usage, but there may be snapshots, reflinks. See Get size of btrfs directory which may contain subvolumes and How to check (simulate), how much space will be freed after I remove a btrfs subvolume?. — Kamil Maciorowski, Feb 09 '24 at 11:31
@KamilMaciorowski, so this is the mount point in /etc/fstab: subvol=/@, compress. Should I remove the @? — lone wolf, Feb 09 '24 at 11:45
No. You should carefully read my answer to the question I linked to (the first link in my first comment). — Kamil Maciorowski, Feb 09 '24 at 12:00
@KamilMaciorowski, I am not getting whatever you have written. — lone wolf, Feb 09 '24 at 12:02
You should mount with subvol=/ somewhere, but without touching what is mounted to your /. An example is mount -o subvol=/ /dev/nvme1n1p4 /mnt/somewhere. Then /mnt/somewhere/@ will be your root subvolume (also mounted to /) and you shouldn't touch it recklessly, but /mnt/somewhere/other_things may be what takes disk space (and in general you shouldn't touch it recklessly either). — Kamil Maciorowski, Feb 09 '24 at 12:04

Unable to find which files are consuming disk space in root partition

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