Does the Roblox device sizer for designing UI represent the actual appearance?

I’ve been using the built in studio device sizing tool to compare my UI to devices. I’ve used all the settings and this problem doesn’t make sense. I have a 1080x1920p monitor and compare it to the 1080x1920p option in studio, and the results are below.

When I join via Roblox app/website:
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Roblox UI device sizer in studio
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As you can see, above or next to the blue lines the frame appears to be the same size as the background frame.

Question: Is this a problem with the studio frames (explorer, properties, toolbar, etc.) taking up the screen and pushing it out of proportion or is it that this tool doesn’t accurately represent the real definition of the GUI?

It’s weird too. It changes on the screen’s resolution very badly.

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