I am trying to record a video of my iOS game, using Quicktime Player, running the iPhone8Plus Simulator in a portrait mode which is supposed to produce a 1080px1920 video. However, the resolution I got is 750x1334 in iMovie after trying to share it as an App Preview.
Please, advise me on what I should do to get the required resolution.
You should use
xcrun simctl io recordVideo ...to record your video. You should tun off 'Optimize Rendering for Window Scale' in Simulator.app.