1. Go to Freeplay and choose any map

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2. Make yourself impostor

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3. Sabotage (Use reactor or oxygen sabotage)

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4. Quickly vent and wait...

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5. Once the countdown for the sabotage finishes, it will come up with the following message:
"Normally the impostor would have just won because of the critical sabotage. Instead we just shut it off"

(Just press the X on the top left of the message and follow step 6)

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6. Start moving around (Don't leave the vent) and you will be invisible...

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You can: Continue Sabotaging, make yourself crewmate and do tasks while invisible and teleport around the map by pressing the arrows on the vent.

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To turn yourself back to normal, just leave the vent...

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You can also watch this video to see how to do step 2-6!