The best way to do this is to group by Identity, or User ID, which will render a table of all users and which funnel steps they completed.
Heap does not currently offer the capability to create a segment of users from a funnel result, though you can create a segment of users that have completed the funnel steps of interest and then analyze these users in the Users view.
Once you’ve validated that the users did follow the funnel steps of interest, you can use this list of users to perform any targeting of people that either converted or dropped off.
For more information about funnel analysis, see our Funnel analysis overview guide.