It is possible to team up and work on a single publication with multiple users simultaneously. We do, however, recommend working on different pages.
Divide the work and agree on a stopping point
Any changes made by other users will only show when you refresh the editor. To avoid creating the same hotspots twice or impacting the work delivered by your teammates, we recommend that each person is assigned a portion of the publication to edit, without overlap.
For example, if two people are working on a 100-page publication, one will start editing on page 1 and stop when he or she finishes editing page 50. The other person will work on pages 51 through 100.