You may want to make sure some
specific roles
are played by the computer. This could be for several reasons:- In an "asynchronous" game, were you would like to have only one human player per game.
- If you have a limited number of players and want to make sure the computer plays specific positions (for example the manufacturer).
You can lock roles from 2 different places:
1) At the Session level:
Setup from the role settings. In this case all the teams will have the same specific role(s) locked. See an example below where we lock the distributor and manufacturer:

Here is how it looks on the participant's perspective, on the session lobby:

2) At the Team level:
Setup from the lobby directly. In this case, you can be more precise and only lock a role in one or several specific team(s):

Note:
As before, once the game as started, the computer will still automatically take over the roles where no one is connected.
So if you don't mind which role may be played by the computer in your session, you don't need to specify which roles to lock. The computer will then intervene only
if and where necessary.