There are a couple of ways to achieve no observation zones on SeeYouM
I believe.

Try Settings Task - then configure the Start, Point, Finish to show
their respective default radius and the angle is 180 degrees for
Radius1 and Angle 1. Make sure the Observation Zone a color you can
see on the screen. It is not a bad idea to fill the observation zones
with a color that stands out.

From the task screen, select the task waypoint, and edit - and make
sure you have Radius 1 at the number you want and Angle 1 at 180
degrees for a circle. Radius 2 / Angle 2 should be blank.

From the main screen, zoom in and out to see if the circles or
observation zones show.

Let us know,

John A8