If your music requires a different beat grouping for a particular meter than the default setting for that time signature, you can specify your preferred beat grouping within the time signature. You can choose whether or not the time signature shows this custom beat grouping. You can also input time signatures only on single staves.
The duration of beam groups in Dorico Pro depends on the beat grouping in the prevailing time signature and your per-flow beam grouping settings in Notation Options. For example, entering [1+1+1+1]/4 into the time signatures popover inputs a time signature with four quarter note (crotchet) groups. Because this creates a time signature with a half-bar, beam grouping options for time signatures with a half-bar apply.
Procedure
Result
The time signature specified is input and beam and beat grouping in subsequent bars follows the division you specified. The time signature appears either as a single number, such as 7/8, or showing the beat groups, such as 2+3+2/8, depending on your setting on the Time Signatures page in Engraving Options.
You can change the appearance of numerators in individual time signatures so that they show a single number or beat groups, independently of your project-wide settings.