According to a Reddit post, the One UI 2.1 has more screen zoom options. The new features are available on the Galaxy S20 series and Galaxy Z Flip, both running One UI 2.1.
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The screen zoom option allows you to set the size of the screen content, such as text and UI element. This new feature should be available on older smartphones with a new update in the future.
You can see the attached image below for more zoom options:
In the One UI 2.1, there are now 5 zoom options, previously there was only 3 zoom options in One UI 2.0.