I just installed Joplin on Debian Linux.
I do not seem to have a zoom option.
This is what I have:
Notes and settings are stored in: /home/myname/.config/joplin-desktop
Keyboard Mode
Language
Date format
Time format
Show note counts
Text editor command
Path:Arguments:
Browse…
Text editor command
The editor command (may include arguments) that will be used to open a note. If none is provided it will try to auto-detect the default editor.
Page size for PDF export
Page orientation for PDF export