According to https://www.nomachine.com/FR09O03514, administrators need the possibility to set a fixed resolution or define the minimum and maximum resolution for the Linux virtual desktop. This can be achieved by adding new keys to node.cfg to let them set:

FixedResolution
MinimumResolution
MaximumResolution

Description of configuration keys:

#
# Set a fixed value for the resolution of the remote screen in case
# of virtual desktops. Users cannot set a different resolution. Value
# is in pixel, e.g. 1280x800.
#
#FixedResolution ""

#
# Set the minimum resolution allowed for the remote screen in case of
# virtual desktops. Value is in pixel, e.g. 800x600.
#
#MinimumResolution ""

#
# Set the maximum resolution allowed for the remote screen in case of
# virtual desktops. Value is in pixel, e.g. 1920x1080.
#
#MaximumResolution ""