Some metadata of the runtime configuration may be overwritten in an user zettel. A subset of those may be overwritten in zettel that is currently used. This allows to specify user specific or zettel specific behavior.
The following metadata keys are supported to provide a more specific behavior:
Key User Zettel Remarks
footer-zettel Y N 
home-zettel Y N 
lang Y Y Making it user-specific could make zettel for other user less useful
show-back-links Y Y 
show-folge-links Y Y 
show-subordinate-links Y Y 
show-successor-links Y Y