Rythmic augmentation

Hello there,

when doing rhythmic augmentation/diminution in insert mode with alt-shift and the L/R arrow keys I noticed it wont go shorter than eight notes. But I have seen people do it in videos. Does this have something to do with the time signature?

Thanks for your help in advance.

Rythmic augmentation.dorico (434.6 KB)

Adjust the rhythmic grid in the bottom left-hand corner of the project window to a resolution shorter than eighth notes.