You can use the tool Checkbox to Show / Hide Objects in order to create a checkbox
that controls the visibility of one or more existing objects on screen.
Alternatively, you could also create a Boolean
variable (e. g., b = true)
using the Input Bar and make it
visible as a checkbox in the Graphics View by changing its visibility status (e. g., use
tool
Show / Hide Object or use the Context Menu).
In order to use this Boolean variable as a condition for the visibility of
certain objects, you need to follow the steps described below.