This command toggles the state/territory status for a specified province. If the specified province is a territory, it will be made into a state - if it is a state, it will be made into a territory.
state [province id]
Search Our Database of 304 EU4 Console Commands
The province ID of Calais is 87 (see province IDs). If Calais is a state, executing this command will make it a territory, otherwise (if Calais is a territory), this command will make it a state.