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Unable to work with graphs with a large number of points

I am trying to plot a graph with 2000-3000 points, colour coded by a third variable. I am unable to load the trace editing panel (e.g. Style then Trace or Colourbar) on plotly 2.0, so can’t change the size/colour of the points. This seems to be caused by having too many points, though in my opinion a few thousand is really not that many. This is really annoying as it used to work in Plotly 1.0. I’m getting very fed up of things that used to work when I paid for the software no longer being functional. Extremely irritating as I have invested time in writing my own python routines to make plots which I then edit online.

Is there some simple solution for this?