As already recommended in this thread, you should set the resolution to the native resolution of the monitor and use render scaling to choose an appropriate render scaling for your GPU’s capabilities. At 4K (3840x2160), 70% scaling renders to a 2688x1512 buffer which is the closest selectable option to 1440p (2560x1440), and will usually look better than setting the resolution to 2560x1440 or 1920x1080 or any other value.
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