Lobby 'Play'/'Library Play'

[Descyphal]

Library play should either close your lobby, or put you in a custom/private lobby.

"Play" from the map library automatically puts you into a game on the library selected map, 1v1 vs an AI with an unorthodox box start that is different from the lobby default preset(east v west) on the same map.
You can also have a map selected in your lobby - Click PLAY on a different map in the library - and your lobby is unaffected. The current lobby map(which is different from the selected map from library) and the lobby settings are not an influence on and/or affected by the library-launched game.

Lobby/Library are separate game launching experiences, and do not cancel each other out.