How do I print a descendant report? I can't find how to print anything.
From the person Details page/tab of the interested person (either of the couple for whom you wish to print a descendancy report) - at bottom of the right-hand column - Tools> Print option shows the types of data that can be printed (pedigree, family group record...). Descendancy report is not an option. You could attempt to print the Descendancy tree view but may not be able to view all the descendants as you wish. If you use a FamilySearch 3rd party tree management application - that may have the type of report you are after. You can find these in the Solution Gallery:
You can also submit the Idea of being able to print such a report within Family Tree at the Suggest an Idea category here in Community: