Hi @emilbebri,
While I have no idea how to configure/remove a setting in fstab it seems like a cache of some sorts, to reduce internet usage.
Instead of using fstab, try using systemd. It’s quite easy to set up:
I suspect you’ll want a fuse mount.
Also see:
https://wiki.archlinux.org/title/dropbox
Else, try mounting it with rclone:
I use rclone and have used rclone mount with dropbox perfectly in the past.
Hope this helps!
Edit:
Just read you post followed by @Aragorn’s answer. And it seems like I completely misunderstood you, so what he said. 
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