How to Get Team Fortress 2 to Go Fullscreen
Hit Alt+Enter while in-game. Magically, fullscreen appears!
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Under launch options, type in '-fullscreen'. This makes it start up in fullscreen automatically.
Go to Options > Video > Display Mode, and select Fullscreen. Boom! Fullscreen goodness.
Easy peasy: Options > Video > Advanced > change the setting to Fullscreen. Kinda obvious when you think about it.
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