Hi stratos, the Hi-Q selector from right clicking the track seems to not be working - I've reported that to the development team.

As a workaround, you can manually apply the Hi-Q synth to the track. Here's a tutorial on how to use VSTi/DXi plugins in RealBand: https://www.pgmusic.com/techfaq63.htm#58

The Sforzando VST is usually located in C:\Program Files\Plogue\sforzando\VST - once you've loaded it, the top left "Instrument" drop down menu will let you select which Hi-Q patch to load.
I work here