Designspace

variation axes

interactive controls for all variation axes in the designspace

sliders

move the knobs to navigate around the font’s designspace

labels

slider values indicate the current location at that axis

restore defaults

click to restore all axes to their default location

edit local axes

open a pop-up window to adjust local axes (?)

sources

a list of all sources available for the current glyph

on

uncheck to remove source from the interpolation for this glyph

bug

indicates that this source is incompatible for interpolation

bg (background)

show/hide this source in the background while editing

bars

displays the influence of this source in the current location

plus

add a new source at a new location for the current glyph

minus

delete current glyph in the selected source