I believe now the more appropriate question is: When? 
The current graph is a raster graphic driven by matplotlib, the new one is close to hitting the shelves I believe and is driven by d3js.
Also see this request for SVG.
With the new graphing comes vector graphics for the graph I assume. Why they haven’t turned on the SVG output of matplotlib I do not know but maybe one of the devs can comment on that.
In the meantime I use the screen zoom feature of macOS to zoom in. Or you can use the zoom level in your browser. It ain’t pretty but for the time being…
Also you can manually zoom by adjusting the settings of the graph:
