Record 2560x1680 window in OBS?

OBS~noob

New Member
Hello people. I'm completely new to OBS and screen recording in general. I have an iMac with a resolution of 5120x2880. I'm wondering if (and how) I can record a 2560x1680 (yes, 2560x1680, not 2560x1600 or 1440) window of the screen? And would it be possible to resize the video in OBS afterward to 1280x840? If not, do you have any recommendations for how? I'm going to use the clips in iMovie to make videos.
 
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