do you mean to make the section fit inside the Layout? or simply to limit the boundaries of your Section?
Nando Mogollon Director @ BuilDigital nando@buildigital.com.au Using, Archicad Latest AU and INT. Revit Latest (have to keep comparing notes) More and more... IFC.js, IFCOpenShell All things Solibri and BIMCollab
The easiest way would be to place 2 views on a layout, one showing the top half of your section down to the "break" line, the other showing the bottom half. Align them as necessary.