The "unset" command:

Usage: fossil settings ?SETTING? ?VALUE? ?OPTIONS?
or: fossil unset SETTING ?OPTIONS?

The "settings" command with no arguments lists all settings and their values. With just a SETTING name it shows the current value of that setting. With a VALUE argument it changes the property for the current repository.

Settings marked as versionable are overridden by the contents of the file named .fossil-settings/PROPERTY in the check-out root, if that file exists.

The "unset" command clears a setting.

Settings can have both a "local" repository-only value and "global" value that applies to all repositories. The local values are stored in the "config" table of the repository and the global values are stored in the configuration database. If both a local and a global value exists for a setting, the local value takes precedence. This command normally operates on the local settings. Use the --global option to change global settings.

Options:

--global
Set or unset the given property globally instead of setting or unsetting it for the open repository only
--exact
Only consider exact name matches
--value
Only show the value of a given property (implies --exact)