Blackmagic Design ATEM Mini Manuel D'installation Et D'utilisation page 22

The multiview is a powerful feature that lets you monitor all sources and outputs simultaneously
Below is a description of each view.
Preview
The preview view lets you monitor the source currently switched to the preview output.
This view is helpful to practice switching between sources, previewing transitions or setting
up a keyer so you can see what it will look like before switching to the program output. You
need to change the switcher operation to program/preview style switching to make use of
the preview view. There is more information about this in later sections of this manual.
Program View
The program view displays what is currently switched to the program output. This view will
always show exactly what you are broadcasting.
Input Views
The input views display all the sources connected to the HDMI inputs. Having all four inputs
on the multiview lets you see the image from every camera so you can make quick decisions.
However they don't always have to be cameras as you could also have a computer's video
output or a HyperDeck disk recorder connected to ATEM Mini Pro's inputs and you can
monitor them in the input views.
When an input is switched to the preview or program output, a green or red tally border will
appear around the input's respective view. Green represents the preview output and red
represents the program output, or 'on air'.
Using the Multiview on ATEM Mini Pro 22