Remmina won't change Viewport fullscreen mode to scrolled fullscreen mode

[eiger3970]

View won’t change Fullscreen mode from Viewport fullscreen mode to Scrolled fullscreen mode.
Stuck in Viewport fullscreen mode which shrinks the monitor display, as there a 3 monitors to fit in. Scrolled fullscreen mode allows 1 monitor to be shown at full monitor size, then scroll to the other 2 monitors.
See also: https://github.com/FreeRDP/Remmina/issues/1618

I cannot change the remote viewing from full screen (showing all 3 monitors in 1 remote screen (shrinking the 3 remote screens) to scroll mode which allows full screen per monitor, then scroll the monitors 2 and 3.