Affinity Photo 2 lets you create projects within which you can store related documents.
The advantage of using projects is that you can organize documents into logical groupings. In doing so, your project documents can be stored under a single project thumbnail which keeps your start up screen less busy. The project thumbnail will display each document's thumbnail within it.
You could create a project for grouping images from a specific day's shooting or store documents based on the editing techniques you've used (e.g. Panoramas or HDR merges).
The project appears as a blank project thumbnail on the Home screen.