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Editing Glyphs - Introduction
From the Font Overview window you can double-click a glyph to open a Glyph Edit window and edit the selected glyph. You can also select a glyph, right-click it and select Edit.
The icon with the two triangles allows you to set the glyph fill (and fill opacity) in the Glyph Edit window. This doesn't affect the end result of your font, but it can be useful to switch between glyph fill options while designing your glyph outlines.
You can "zoom in" to get a close-up view of your glyph or "zoom out" to see more of the page at a reduced size. You can use the edit field located on the Drawing toolbar to change the zoom percentage. The Zoom to Selected button will be enabled as soon as contours or points are selected. Pressing this button will zoom into the current selection. When you press the Fit to Window button, the glyph will be shown with the largest zoom factor that also shows the ascender and descender lines.
In a TrueType font, glyph shapes are described by their outlines. There are three glyph outline types:
Composite glyphs are simply a combination of two or more other glyphs - usually, but not limited to, a base character and one or more diacritical marks that are placed above and/ or below the base character.
To select a composite member click on it. If you want to modify specific member data double-click a composite member to open the Composite Glyph Properties window.
Other parts of the manual have a comprehensive explanation of the three glyph types.