I'm a YouTuber and normally I render my videos for YouTube 1920x1080p, basic stuff right. But as I have other social media (Facebook, Instagram) and I'd like to upload my videos there in square format. I've done this already a few times with 1920x1920 project settings and rendering, which gives decent results. However, the letterbox effect (the bars above and below the actual video) are quite large and I've seen other Facebook pages sharing square videos with a bit more narrow bars. So basically when I'm rendering for square video, I have my 1920x1080p video, which I rendered for YouTube, brought in the 1920x1920 project. Any tips for this problem?