Newbie - Blurred preview

Please bear with me - literally just started learning to use Glyphs 3 - previously working with Fontlab. My glyph preview is blurred. The blur slider is set to 0, I’ve read everything I can in the handbook and on the forums, but can’t seem to find out whats happening - see screenshot.

Check View > Show Pixel Preview

Facepalm!! Thank you Georg!