I think it should be possible to add custom axis breaks to the Graph Builder, in the same way it is often possible in other graphing software like Origin Lab.
At the moment, producing a good display for continuous X-axis data with X-axis grouping is quite involved. For example: if we have continuous timestamps over multiple days, but the data goes only for one hour during each day, but you still want the graph to show the course during a single day.
Previous post explaining the problem:
https://community.jmp.com/t5/Discussions/How-to-insert-X-axis-break-in-graph-builder/m-p/525673