Is it possible to render Roblox on higher resolutions such as 4K?

So I saw this video:

I decided to put the video on full screen on my 4k monitor and I immediately noticed that the game was rendered in 4k (I am aware of the title of the video), why? because when I play Roblox, the render resolution is lower than that of the video above (I believe its 1080p), but only the UI is in 4k, not the render resolution.

Is there any way I can achieve 4k on Roblox?

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Likely some kind of fast flag. Roblox itself doesn’t provide many settings for graphics.

Interesting, I have searched for the solution for quite a while (still cannot find it), I’m gonna try finding something like that.

Didn’t find anything.