The TV mirrors your card game: check whether Windows is duplicating displays
When a connected TV shows the same game as the laptop, check display mode before changing the game’s own monitor setting. A duplicated display shows a copy of the same desktop.
What to check
Microsoft documents the projection menu under Windows key plus P. Read the mode currently selected. Duplicate shows the same content, while Extend gives the desktop additional space. Use Identify in Display settings if the physical screens are hard to tell apart.
Compare one example
For a game and a separate reference window, first confirm that the reference window can move independently onto the extended desktop. If a game still opens on the wrong screen after the desktop is extended, record the game’s display setting separately. Check privacy before mirroring a display in a shared room.