What does the property app.documents.marginPreferences.columnCount refer to?
It's valid but changing the value doesn't change the display of anything I can see.
It's not the number of columns that display on thepage. That property is
Thanks for helping me understand the DOM ...
@Rick – you can use that property to pre-define the column count for new master spreads.
app.documents.marginPreferences.columnCount = 4; app.documents.masterSpreads.add();
The added master spread should have 4 columns.