Biomorphologies in tournament

[bugsy]

If you play in a tournament, would you be able to switch biomorphologies between each match/fight or do you choose one for the whole tournament?

[No One]

Matched Play Rule: Hyper-adaptations
When playing a matched play game, players cannot swap out the Adaptive element of their Hive Fleet Adaptation at the start of the battle after determining who has the first turn – if they wish to do so, this must instead be done during the Muster Armies step, and the player’s selection written on their army roster.

It's as valid as swapping powers/WLT etc i.e. no.