You can check that using e.g. df -Th on the command line.
/dev/nvme0n1p7 ext4 358G 189G 152G 56% /
but if you also using ecryptfs, you have another entry
/home/julian/.Private ecryptfs 358G 189G 152G 56% /home/julian/Private
Ecryptfs has a recommendation to limit the file names to ~140 chars. If you have this problem, you can create a new ext4 partition where you put only your Cryptomator vaults inside and benefit of the HUGE performance improvement because the files / folders are not encrypted / decrypted twice with ecryptfs and Cryptomator but only by the latter tool.
/dev/nvme0n1p8 ext4 25G 16G 7,5G 68% /media/cm