Assigned and universal promos work like short commercials. They can appear within the broadcast area or you can make them fullscreen.
From your Dashboard
In the left side menu under VMcast, click “Manage Promos.”
This is the promos manager for your account. Select your promo. If you don't have any promos, create one.
Click the "Settings" tab.
Under "Playback Options," click "Edit."
Choose the "Play in Fullscreen" option and click "Save."
Your promo is now set to display fullscreen on a stream! Your promo will fill the TV screen, temporarily hiding all of the other VMcast frames.