If I have TF2 open on one monitor if I click on any other tab in the second monitor it minimizes the game.
Is there any way I can fix this?
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You can switch windows without minimizing by using Borderless windowed mode.
This can be done in a couple ways, the easiest is by going into your "Options> Video" settings in game and setting the game to "Run in a Window".
Alternatively you can modify your launch settings by adding the launch options
-windowed -noborder in the TF2s "Properties > General" settings directly in Steam.
I addition to the in-game option mentioned in the main answer, you can use Steam Launch options - I use these for Counter Strike and they work for TF2 as well.
-window -noborder -novid -nojoy -w 2560 -h 1080