For instruments like trumpet and horn, fingering is used to show which valves must be depressed to produce a specific note.
You can enter fingerings for valved brass instruments into the fingerings popover as numbers without any separation. For example, enter 12 for a C♯ on a trumpet to indicate that the first two valves must be depressed.
By default, Dorico Pro automatically stacks fingerings added to notes on brass instrument staves vertically. They are shown with no separator by default.
You can change the appearance of fingerings for valved brass instruments in the Brass section of the Fingering page in Engraving Options. For example, you can show fingerings for valved brass instruments in a single row or stacked vertically. You can also change the appearance of the separator or show no separator.
You can also edit the formatting of the fonts used for the different parts of fingerings for valved brass instruments.