I installed the browser extension but it only seems to be able to record tabs inside a browser.
What if I'm running a desktop app and want to create an explainer video for how to use it?
How can I simply record any part of my screen?

Also, your roadmap link is broken.
This link doesn't work: https://layerpath.canny.io/
But I found this other link that works is: https://layperpath.canny.io/