Check out this video of Mavis Co-Founder, Dr Phil, as he dives into the Monitor Tools (including Expanded Focus) inside Mavis Camera:
The expanded focus visualisation is another tool to assist with focusing. The image within the monitor viewfinder can be zoomed to make it easier to see when your subject matter is sharp and in focus. As with all the Mavis Camera visualisations, the expanded focus is only applied in the viewfinder.
Tip: Don't forget to switch off expanded focus as you may accidentally think you are recording a close up shot!