If you set the screen's background color used
for a call screen, the objects placed on the screen are not
displayed on the display unit.
A maximum of 10 nesting levels (11 layers) can
be set for Call Screens.
For example, 2 nesting levels (3 layers)
While creating the project, if the computer
memory capacity gets low, and the screen is set up with multiple
levels of call screens, the nested screens may not appear on the
editor. However, once transferred to the display unit, they will
display properly.
