Leave Party

The primary command to remove your character from a party (or group), if your character is in a party.

Ways to Leave Party:
 * Right-click your portrait and select Leave Party.
 * Create a Macro or Type the command /script C_PartyInfo.LeaveParty
 * Changed in Shadowlands Prepatch 9.0.1 from /script LeaveParty

Choosing to leave party with only a leader as the other member effectively disbands the party.