I noticed that Dorico makes slurs connecting grace notes to regular notes smaller and thinner.
I don’t think this is correct. Everywhere I looked a slur stays at its normal size.
The reason being, that It belongs both to a grace note and to the following, regular note.
The exception for a slur to be grace-note size is for cues.
Thanks for the feedback. We scale down the various parameters controlling curvature, shouldering, etc. in order to make the slur an appropriate shape when rendered with a much shorter length, and what we found is that slurs with the normal thickness look too bulbous in such circumstances. I’m not sure whether or not we will introduce an option to make such slurs fatter again, but you can override the thickness of each individual slur using the Properties panel if you want to make the adjustment yourself for the time being.