A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
If you're using the Formula Builder task pane use the Tab key to navigate from one argument field to the next. (It usually needs to be pressed twice.)
If that isn't the issue please provide a more complete description explaining the steps you're taking & what you expect by using the Arrow keys. An explicit example would be helpful. Be sure to include macOS & Office Version Numbers whenever submitting a question.