Unions aren't perfect. If you Negate a small section out of a large Part it probably won't work the way you expect. ROBLOX Unions deal with percentages. But here's a way to see how a Union will react physically.
Go to your Studio File tab.
Click Settings, select Physics, and click the ShowDecompostionGeometry box.
You will get messages about changing your settings, but this is just a display item.
In Studio you may have to change the colour of the Union, or actually Test the place to get the settings to change.
Your Unions will now be displayed as a bunch of polygon shapes that indicate how the Union will react to other Parts in game.
To reverse it just go back to Settings and uncheck that box.
In cases like this I make the Union smaller so the Negated section is a larger percent of the Union, or I just make the Union CanCollide off and add a bunch of transparent Parts that are the shape I want players to hit.
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