When you've finished your current session or completed your design you can close your document, keeping the Affinity app open to work on other open documents or create new documents from scratch.
On closure, you'll be prompted to save your document if it has unsaved changes. For multiple open documents, you can save all your documents' changes in one operation or one-by-one.
Do one of the following:
Unmodified documents will close automatically, but you'll be prompted to save any unsaved changes.