On Sleeper, we give commissioners full control of their leagues, so they are given a ton of options and settings to work with.
When a commissioner uses one of the more advanced tools, there will be a message that appears in the league chat automatically. This is intentional on our end so that the rest of the league is aware that the commish took this action.
We will not offer an option to disable these from appearing in the league chat.
These are the following commissioner actions that will automatically send a chat message in the league chat:
Change in scoring settings
Updating the draft time
Resetting the league to pre-draft mode
Removing a user from the league
Editing Lineups and Matchup Scores/Records
Force Add/Drop of players
Unassigning and assigning users to teams
Updating league notes
Updating nicknames
Randomizing the draft order