Solved
From the "Diagramming" menu about 2/3 of the way over from the left there is a section called "Crossovers"... from here click "Add"

The size of the crossover is determined by the grid size so if you want them a different size you'll need to adjust that as well. You'll have to click remove then add again after updating grid size. To do this go to "Tools" -> "Grid" -> "Grid Properties"

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