Rumors have consistently revealed Samsung Galaxy S8 would be coming with a 5.8-inch display whereas the larger Galaxy S8+ would be arriving with a 6.2-inch screen. Both the screens are expected to support a WQHD+ resolution of 2,960 x 1,440 pixels with an aspect ratio of 18.5:9.
A leaked shot of what appears to be a live Galaxy S8 or S8+ phone has revealed that it would allow users to easily adjust the screen resolution manually. The leaked photo suggests that the S8 and S8+ would provide users with three levels of screen resolution such as 1480 x 720 (HD+), 2,220 x 1,080 (FHD+) and 2,960 x 1,440 (WQHD+).
Also, compared to the traditional 720 x 1,280 (HD), 1,920 x 1,080 (FHD) and 2,560 x 1,440 (QHD), the three screen resolution options on S8 and S8+ respectively offer 200, 300 and 400 additional pixels. For powering saving, the default screen resolution for S8/S8+ is 2,220 x 1,080 pixels.
After Nougat update, the Galaxy S7 and S7 Edge smartphones allow users to manually adjust between HD, FHD and QHD resolutions. This can be done by navigating to Settings > Display > Change screen resolution. The same procedure could possibly available on Nougat OS powered Galaxy S8 and S8+ phones.
(source)
