Need to reset old settings I don't know what I did

[SPOS50]

Hello I was trying to access and change a block and I accidentally changed stores or something somehow and now all my categories, products and banners are not showing up in the admin section but the products are still on the site. I'm confused at what I did and it and just want to undo it

[Basara]

Go to any page in admin where Select store drop-down appears (System > Settings or Catalog > Categories) and change store. Then navigate to page with block