How to halve the time signature?

As it turns out, this shortcut isn’t going to work for me; perhaps I need to go back to Cubase and change something there before I export the Midi to Dorico?

Halving the note durations just creates rests in between everything, even if the time signature is reduced from 4/4 to 2/4.
Screen Shot 2019-05-20 at 10.41.53.png
Screen Shot 2019-05-20 at 10.42.26.png
When what I really want is this:
Screen Shot 2019-05-20 at 10.45.42.png