The Options dialog is found under the R upper left corner:
File Locations tab
Default template file:
S:\Revit Templates\Revit 20xx\Project\Project Template.rte
Default path for user files:
C:\!revitLOCAL
Default path for family template files:
S:\Revit Templates\Revit 20xx\Families
Root path for point clouds:
C:\!revitLOCAL