Up till now I have only looked at small areas, so this problem may not have been apparent, but now, looking at a "World" shapefile, the screen image is obviously distorted.

View > Decorations > Grid > X=1 Y=1
gives a square grid pattern, when I was expecting a "rectangular" pattern - reflecting the length of a degree of Latitude (constant at 60 nautical miles = 111 Km) and the length of a degree of Longitude (variable - shorter near poles).

I have tried various different CRS selections, and 3 different shapefiles, but always the same - the screen image appears stretched in the E-W direction.

Plug-in "Globe" correctly maps the shapefile onto a globe, so it's not file at fault.

I'm at a loss for vocabulary to describe it properly, or to look it up in Help.
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