Adaptive refresh looks to be a Note 20 exclusive.

The Samsung Galaxy Note 20 only just hit shelves this week, but many of its features are already coming to the Galaxy S20. Samsung has announced that One UI 2.5, which debuted on the new Note, has already begun rolling out to S20 phones and should arrive in the U.S. soon.

Among the new features outlined below are enhancements to video recording, Samsung Notes, and DeX, but it appears the S20 won’t be getting the Note 20 Ultra’s best feature: adaptive refresh. On Samsung’s newest Note, in order to conserve battery life the display will automatically lower to 60Hz when the phone is at rest or when using an app that doesn’t benefit from the higher refresh rate.
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https://www.pcworld.com/article/3572333/galaxy-note-20-galaxy-s20-features-samsung-one-ui-25-camera-notes-dex-refresh.html