Go to Settings > Processor Settings > Job Tags.
The page help text says: “Create the tags — icon, name, and the species each applies to — that you can put on a job. Tags mark jobs that need handling differently — a farm kill, a rush order, a religious slaughter. Each tag carries an icon that shows on the calendar and in your job list, and can be limited to the species it applies to. Disabling a tag retires it — it drops out of the pickers, but jobs already carrying it keep showing it.”
Each tag row has an icon button, Name, Species (default All species), a preview chip, an Enabled switch, and a trash icon.
A New tag row includes Add, which is enabled once the tag is named. Click Save to save. The page also has a View Audit Log link.
The Jobs list has a Tags filter.
