The victors move up to 3" in any direction to take advantage of cover/ground to consolidate their position. This is the only action a winner can take if they won the combat through a tie-breaker roll off. Units consolidating their position ignore difficult terrain.
Consolidate
Source: Core Rulebook 3E, p. 69
Victors who do not advance may instead move up to 3" in any direction, ignoring difficult terrain, to improve their position — the only option after winning on a tiebreaker.