As others have mentioned, you can't - there are good reasons behind this in terms of trying to make it a little harder to perpetuate bad information.
You can bring down a family group at a time, i.e. a person, their parents, their spouse, and their children. Then you go to the mother and do the same, and then the father. You work your way up the tree that way.
I understand not everyone is really interested in "Genealogy" (i.e. accurate, verifiable history) and just use Ancestry as a fun diversion & "what if". Nothing wrong with that, but please make your tree private if this is what you're doing, so you don't perpetuate bad data.
You can bring down a family group at a time, i.e. a person, their parents, their spouse, and their children. Then you go to the mother and do the same, and then the father. You work your way up the tree that way.
I understand not everyone is really interested in "Genealogy" (i.e. accurate, verifiable history) and just use Ancestry as a fun diversion & "what if". Nothing wrong with that, but please make your tree private if this is what you're doing, so you don't perpetuate bad data.