This command sets the isolation level (0 - 4) of the country you are playing as to the specified number. Note that this command applies to the Shinto religion.
isolationism [level] DLC: Common Sense
Level | A number between 0 and 4 (4 being the most isolated). The level you wish to set your country's isolationism to. |
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isolationism 2
The above console command would set your country's isolation level to 2.