What do these interface lines represent?

I know the linework goes into this shape, but don’t know what the frame / edges represent, and couldn’t find it in the guide:

Any help appreciated!

The width of the box is the width of the glyph. Activate View > Metrics Names to get labels for each vertical line. Those positions are defined in Font Info > Masters > Metrics.

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Hi Georg-

Sorry, I only see this:

Also, I’d like to know about the horizontal lines.
cheers

What version of Glyphs do you have?

The horizontal lines are descender, baseline, x-height and cap-height/ascender.

Glyphs Mini, 2.1.10 (122).

Then you can control the lines in Font Info (the “i” in the toolbar).

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Got it! Thanks!