ETC Congo Family v6.4.0 - Manual (Page 544)

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Channel Layouts - Boxes and Circles (6.0)
Boxes and circles can be filled or frames and have a text label.
1. Select box or circle object with the arrow in the lower corner of the object box.
2. Click and drag to draw a box or circle.
3. Click and drag again to create a new box or circle.
Select the arrow tool to edit an existing box or circle.
NOTE
If you click on a box or circle in an active layout, you will select all
channels inside. If you double click, all other channels will be de-
selected first. Objects like palettes will be executed when clicked on.