Version 26.1.3 adds two new features to Match Lobbies: Auto-Start and Notify Host

Auto-Start

When the final available country is selected for a match with Auto-Start enabled, the game settings and countries will be locked, and a 24-hour countdown will begin. If the host does not delete the lobby or start the match manually by the end of the 24-hour countdown, the match will begin automatically.

Notify Host

Notify Host works in tandem with Auto-Start. If the host doesn't want the match to start automatically, they can still choose to be notified when every available country has been selected.

Both of these settings are enabled by default for new matches but can by disabled by the host.