Hello UnclePlusMax and welcome!
If you wish to change the capture mode to a game capture card or capture device, go to OPTIONS on the toolbar at the top. Then click on the VIDEO tab and select the CAPTURE DEVICE so you can choose your game capture card.
If you are referring to Fast Capture Mode or video game console formats, locate the RECORD SCREEN AS dropdown on the lower left of the Debut main window. Click on the dropdown and choose the desired format, eg. xbox, Fast capture, mp4, etc.