Read the statement by Michael Teeuw here.
MMM-PlexSlideshow In region instead of fullscreen
How can I put MMM-PlexSlideshow in a region instead of ‘fullscreen-below’?
I tried for example ‘middle_center’ but only shows a very thin strip of the picture (see picture) not filling the region. Is there a way to actually define height and width of the frame within the region where I would like for the slideshow ?