A 'Round-Robin Heads-Up Standard Tournament' is a type of tournament managed by the application. It falls under the category of standard tournaments.
In this type of tournament, each player plays the same number of matches (ideally, the same number of matches against each player...but that does not need to be the case). When all the matches are complete, the players are ranked by their match won/loss record to determine the tournament finishing order.
Many people consider a round-robin heads-up tournament superior to a bracketed heads-up tournament because all players continue to participate until the tournament is complete.
A major drawback, however, is that at some point it is mathematically impossible for players to place in the money, yet they continue to play...perhaps without much effort...and that may not be in the best interests of the players that still have a shot at the money. If that is a concern, consider the "Round-Robin Heads-Up Fixed-Elimination Standard Tournament".
A Round-Robin Heads-Up Standard Tournament is managed in the Round-Robin Heads-Up Standard Tournament Management Panel.