While converting a note to a rest with [R] the duration of the original note is adopted.
However, there may still be times when you need to adjust the length of a rest. Simply select the appropriate rest and „double“ [.] or „halve“ [,] its value (or add/remove dots) just as you do with notes (see Note Entry / Duration).
Sometimes you may recognize that the beams are not drawn correctly when you have converted a note to a rest from grouped notes. To release the rest from the group just select the rest (and the previous or next note where the beam comes from; if necessary) and break the beam by typing [X] on your keyoard.