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How do you sideboard?

After each game in a match, the player who won that game chooses to sideboard a character
first, and declares their team. Then, the player who lost the previous game does the same. Then
both players swap battle cards between their main deck and sideboard simultaneously.
Players are not required to reveal how many battle cards they have swapped from their main
deck to their sideboard and do not have to swap one for one, but after sideboarding, their
sideboard may not exceed the maximum sideboard size (10 battle cards).
Source: Wizards of the Coast (2019-11-21)    【Link to Ruling】
Tags: Sideboarding