How do I add my desktop to sparkle?

Can’t figure out how to add new folders to this app so it can organize files? Seems like weird thing not to be obvious in the UI, like a “+” icon or something should be there to add an Active Smart Folder? Also need bertter support/help for little how-to’s like this in the app. Not sure I would continue using this product based on initial impact, also unclear why I would replace Mac Spotlight bar? What am I missing? What is this app good at vs. Mac not good at?