This is a two-color mode design. Prusa slicer should auto-detect this as a logo and suggest a color change layer. If you just want an empty frame to add your own image you can use this stl file https://www.prusaprinters.org/prints/122839-empty-frame-file-with-elevated-border-for-imagelog
The author marked this model as their own original creation. Imported from Thingiverse.