The market share is increasing dramatically for mobile phones (e.g. Experia 1 II, Moto 5G plus etc…) which sport a 21:9 resolution (i.e the standard aspect ratio for Cinemascope). At present there is no way to test this aspect ratio within 001 and none of the devices/resolutions listed result in a 21:9 format. As this format grows in popularity, it is desireable (probably essential in fact) that apps produced with 001 can support this format. Would it therefore be possible to include at least one device/resolution for 21:9 in the supported test device list?
21:9 Aspect RatioSupport
You can use any main resolutions you want to get whatever aspect ratio you need. May also want to take a look at Alternative Layouts (Interface → Add Alternative Layout (+ icon beside (Default) dropdown).