Hey,
Cannot understand what you do
First, switch to dual viewer, multicam is made to be used this way : on the right you see the TL viewer with your actual angle choice, on the left viewer you see your different angles you can click on...
So first : dual viewer please.
Then, on the left viewer, I think you'll want to click the "fit" choice (instead of this 100% burden I saw in the video

)
Then it will be ok for sure...
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*https://www.buymeacoffee.com/videorhin