When going onto the "Storage" Option In the "Options" Tab of the Minecraft Home Screen, there comes an option to delete certain items manually, such as data packs, behavior packs, and worlds, now, recently, I clicked on my worlds folder in that menu to delete a world, and decided to delete an old world, named Xrarchapelago, when I click Xrarchapelago, under it came a few buttons, one of which was to trash it, so that's the one I clicked, yet, once it was done deleting, I had noticed that my world folder went down 200 Megabytes, and not the 70 or so it would've gone down had it deleted the right world, I checked my worlds folder and my worlds tab, to notice, my 200 MB, year old survival world I'd grinded on, and built so much on, that I built a memorial to my dead dog to, named "Main" had disappeared instead, and Xrarchapelago Remained. I've used this tab in the Storage Option to delete many worlds prior, and it has worked perfectly fine up until yesterday.