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So you could choose either the highest resolution or the highest refresh rate. With that said, here’s how you can enable QHD+ resolution and 120Hz on the Galaxy S21 Ultra.

The refresh rate is measured in hertz (Hz), and it dictates how often the frame can change. A refresh rate of 120 Hz allows a new frame to be displayed up to 120 times every second.

Enable Developer Options Toggle “Force 90 Hz refresh rate” Note: It’s important to note that enabling the 90 Hz refresh rate on the Pixel 4 display will drastically decrease your battery life.

Change polling rate to 500Hz: Press button 5 on the mouse while plugging it in. Change polling rate to 1000Hz: Press button 4 on the mouse and plug it in.