The Korean tech brand Samsung is world-famous for its display. Samsung launched the Galaxy S20 flagship with an entirely flawless display. But they had somewhat strange limitations. It has a 120Hz refresh rate on the display. The S20 series has toned down to 1080P resolution to keep the 120Hz refresh rate on the display. But if you take a look at Samsung Galaxy S21 series then, they have also a 120Hz refresh rate.
But, they are able to keep the resolution on WQHD+. It’s absolutely amazing. See here the screenshot given by Ice Universe. Here the adaptive refresh rate is on while the resolution is 1440 x 3200px. But it’s the Samsung Galaxy S21 Ultra only. So, the other duo of this series may not apply this theory at all. The S21 and S21+ are rumored to get 1080p panels in the first place.