I've only been using SPlat for a few days (yes, I finally let go of 8.5; new computer, new horizons) so ATM it's not always obvious whether a roadblock is user error or a bug.
 
When I right-click on an Instrument in the plugin browser, I get a Properties dialog. Same for MIDI FX. But I do not get one when I right-click on an audio effect. The Help documentation says I should, even shows a screenshot as proof. But a right-click does nothing for me in the audio FX browser. What's up?

Depends on the Sort option. Sort by Category displays the "Set Properties" dialog. The layout and sort options are set in the menu on the Plugins tab.

Thanks, Steve.