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You have to be in Commissioner mode (manager menu --> team control settings). Once you have that enabled, an option to edit the ballpark will appear on the team settings screen.
You can update dimensions, park factors, weather, ballpark pictures, etc. But as iggyhood notes, the park factors are the thing that actually influences results, not the dimensions. So for example, if you move all your fences out 100 feet and don't touch the park factors, you'll still get the same number of home runs, they'll all just be 500-footers.
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"Sometimes, this is like going to a grocery store. You’ve got a list until you get to the check-out stand. And then you start reading People magazine, and all this other [stuff] ends up in the basket."
-Sandy Alderson on the MLB offseason
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