With SmartSDR v2.3.7, the panadapter filter controls/display, at the bottom of the spectrum display at the 0 Hz indicator, don't seem to be available when spots are enabled. disabling spots makes them available again. Possibly a bug?
This is by design. If the filter widget is shown on top of a spot, you cannot click on the spot and it obscures the spot. Feedback from the alpha team indicated that the most prevalent use case was interfacing with the spot, not showing and interfacing with the filter widget.