I did hit enter on the command window. Maybe that killed the command? I've re-entered the rclone mount -vv remote:/test/ ~/dropbox/test command and the log is as below.
2023/03/15 11:44:53 DEBUG : Creating backend with remote "remote:/test/"
2023/03/15 11:44:53 DEBUG : Using config file from "/home/.config/rclone/rclone.conf"
2023/03/15 11:44:54 DEBUG : Dropbox root '': Using root namespace "196693667"
2023/03/15 11:44:54 DEBUG : fs cache: renaming cache item "remote:/test/" to be canonical "remote:test"
2023/03/15 11:44:55 DEBUG : Dropbox root 'test': Mounting on "/home/dropbox/test"
2023/03/15 11:44:55 DEBUG : : Root:
2023/03/15 11:44:55 DEBUG : : >Root: node=/, err=<nil>
2023/03/15 11:45:55 DEBUG : Dropbox root 'test': Checking for changes on remote
2023/03/15 11:50:57 DEBUG : Dropbox root 'test': Checking for changes on remote
2023/03/15 11:56:07 DEBUG : Dropbox root 'test': Checking for changes on remote
2023/03/15 12:01:28 DEBUG : Dropbox root 'test': Checking for changes on remote
2023/03/15 12:06:31 DEBUG : Dropbox root 'test': Checking for changes on remote
2023/03/15 12:11:55 DEBUG : Dropbox root 'test': Checking for changes on remote