Add posts on either side of an area where you’ll need a gate. You can do this by carefully selecting a line of fencing and then double-clicking to drop a post on one side of the gate. Then select the line of fencing again and double-click to drop a post on the other side of the gate. Finally, select the line of fencing between the two posts and convert it from fencing to a gate by changing the panel type from “FENCE” to “GATE”. Be sure to also specify the width of the gate in the right sidebar.