|Step 1: Press the X button and open the VS menu.|
|Step 2: Select Live Competition.|
|Step 3: Select Host a Live Competition.|
|Step 4: Select Watch battles. (if you are using LAN Mode, hold the L button and R button and then press the left stick in prior to selecting)|
|Step 5: Enter the match ID. For Spectator Mode, the match ID is XX3 through XX9; for example, if you are wanting to spectate a match where player 1 used match ID 641 and player 2 used match ID 642, you can use match ID 643 to spectate.
If a second system is being used to spectate, you can use match ID 644. A maximum of seven Nintendo Switch systems can spectate a match at one time.