This option adds display modes to DXGL, even if they are not available on the current display. These modes only appear if supported by the current scaling mode.
The following items are available:

Common low resolutions

Adds low-resolution modes that are common on older Windows based computers. This option is recommended to be enabled to improve compatibility with some older games.
The following video modes are added:
320x200, 70Hz refresh
320x240, 60Hz refresh
320x400, 70Hz refresh
320x480, 60Hz refresh
640x400, 70Hz refresh
In addition, if the postprocess scaling is set to automatic, this will attempt to add pixel-doubled resolutions for the following:
640x350, 70Hz refresh -> 320x175
640x400, 70Hz refresh -> 320x200
640x480, 60Hz refresh -> 320x480
640x400, 70Hz refresh -> 320x400
640x480, 60Hz refresh -> 320x480
640x400, 60Hz refresh -> 640x200
720x400, 70Hz refresh -> 360x200
720x480, 60Hz refresh -> 360x240
720x400, 70Hz refresh -> 360x400
720x480, 60Hz refresh -> 360x480
800x600, 56Hz refresh -> 400x300
800x600, 60Hz refresh -> 400x300

Uncommon low resolutions

Adds several low resolution modes commonly used on older DOS and VESA 2.0 based computers.
The following video modes are added:
360x200, 70Hz refresh
360x240, 60Hz refresh
360x400, 70Hz refresh
360x480, 60Hz refresh
400x300, 60Hz refresh

Uncommon SD resolutions

Adds a few uncommon and widescreen standard-definition resolutions, including modes used on old VESA 2.0 displays, EGA displays, and small widescreen displays.
The following video modes are added:
512x384, 60Hz refresh
640x350, 70Hz refresh
640x360, 60Hz refresh
720x400, 70Hz refresh
720x480, 70Hz refresh
960x540, 60Hz refresh
960x600, 60Hz refresh
960x720, 60Hz refresh
1024x600, 60Hz refresh

High Definition resolutions

Adds several high definition resolutions to the list of available modes.
The following video modes are added:
1024x800, 60Hz refresh
1280x720, 60Hz refresh
1280x800, 60Hz refresh
1360x768, 60Hz refresh
1366x768, 60Hz refresh
1400x1050, 60Hz refresh
1440x900, 60Hz refresh
1600x800, 60Hz refresh
1680x1050, 60Hz refresh
1920x1080, 60Hz refresh
1920x1200, 60Hz refresh
2048x1080, 60Hz refresh

Ultra-HD resolutions

Adds several Quad-HD and UHD resolutions to the list of available modes. Your GPU must support 4096 wide textures for these modes to work.
The following video modes are added:
2560x1080, 60Hz refresh
2560x1440, 60Hz refresh
2560x1600, 60Hz refresh
2560x1920, 60Hz refresh
2560x2048, 60Hz refresh
2800x2100, 60Hz refresh
3200x1800, 60Hz refresh
3200x2048, 60Hz refresh
3840x2160, 60Hz refresh
3840x2400, 60Hz refresh
4096x2304, 60Hz refresh
4096x3072, 60Hz refresh

Ultra-HD above 4k

Adds several UHD resolutions greater than 4k to the list of available modes.
Your GPU must support 8192 wide textures for these modes to work.
The following video modes are added:
5120x2880, 60Hz refresh
5120x3200, 60Hz refresh
5120x4096, 60Hz refresh
6400x4800, 60Hz refresh
7680x4320, 60Hz refresh
7680x4800, 60Hz refresh
8192x4608, 60Hz refresh

Very uncommon resolutions

Adds several unusual display resolutions, including some resolutions used by video game consoles, and some modes found on certain Linux display drivers.
The following video modes are added:
240x160, 60Hz refresh
256x224, 60Hz refresh
256x240, 60Hz refresh
320x175, 60Hz refresh
320x224, 60Hz refresh
400x240, 60Hz refresh
416x312, 75Hz refresh
512x448, 60Hz refresh
512x480, 60Hz refresh
576x432, 60Hz refresh
640x200, 60Hz refresh
640x512, 60Hz refresh
700x525, 60Hz refresh
720x350, 70Hz refresh
720x450, 60Hz refresh
800x512, 60Hz refresh
832x624, 75Hz refresh
840x525, 60Hz refresh
896x672, 60Hz refresh
928x696, 60Hz refresh

Common SVGA resolutions

Adds several common 4:3 and 5:4 display resolutions used by SVGA type graphics adapters. This option is useful when running under Wine on a system that doesn’t support mode switching.
The following video modes are added:
640x480, 60Hz refresh
800x600, 56Hz refresh
800x600, 60Hz refresh
1024x768, 60Hz refresh
1152x864, 60Hz refresh
1280x960, 60Hz refresh
1280x1024, 60Hz refresh
1600x1200, 60Hz refresh
1920x1440, 60Hz refresh
2048x1536, 60Hz refresh