Many people face the problem of a glitch while exporting the video in 1080p. While exporting the video, you might not see the option for 1080p; it could be greyed out. This usually happens when you try to export the screen recording. However, you can solve this problem.
You need to import a video clip that is 1080p. Remove everything from the timeline. Now, drag the 1080p video to the timeline, and then drag your screen recording. Select both the clips in the timeline and click on the export button. You will see the 1080p option there. Don't export the video now; go back and delete that 1080p video from the timeline. Now, you are good to export your screen recording in 1080p.