I’m setting the stem values for a font and the icons that replaced the text “Horizontal Stem” and “Vertical Stem” are somewhat ambiguous: I just wanted to be extra sure: does the horizontal double arrow mean a horizontal stem?
Also, what’s the purpose of the boxes on the right, set to 0 by default?
I suggest adding some textual popups for new users and pros alike 
You can think of the arrows like so:
See section 8.2.5, page 108 of the Handbook for details:
https://cdn2.glyphsapp.com/media/pages/learn/f84e457b88-1639830290/glyphs-3.0.4-handbook.pdf#page108
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