Your Samsung Galaxy Galaxy S20, S20+, or S20 Ultra has a stunning display that’s capable of running at 120Hz. Out of the box, the handset is set to WQHD+ (3,200 x 1,440), which can only run at 60Hz and uses the most battery life. If you want to change your screen resolution, you can set it to HD+ (1,600 x 720) or FHD+ (2,400 x 1,080).
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Source : Samsung Galaxy S20: How to Change Your Screen Resolution
