You can choose how to display crossing routes in a diagram view.
Before you begin: In Me > Preferences > App Preferences > 3D Modeling> Systems Architecture > Functional and Systems Design > Diagram View, set the convenient options in Crossing Lines in Diagram View.
From the Layout section of the action bar, click Apply Gap on Routes.
The display you have selected
is applied every time a route crosses another one. In this scenario, the Gap option is selected and the horizontal routes have the priority over the vertical ones.
Click Remove Gap on Routes.
The Apply Gap on Routes command is deactivated and the gaps are removed.