The grid width defines how coordinates get rounded. Default is the value 1. When set to zero, no rounding will happen. This is useful if you want to keep very fine details, e.g. after applying the Hatch Outlines filter or in detailed dingbat fonts, or if you plan to scale your glyphs and want to minimize rounding errors. Higher values are helpful when creating a pixel font.
All tools and all modifications will consequently snap to the grid. You can force all point coordinates of selected glyphs into the grid by choosing Round Coordinates from the Layers menu.
The Subdivision value gives you the option to subdivide the Grid Spacing if you need finer steps but want the larger grid spacing as design orientation. The value indicates into how many compartments the main grid is subdivided, e.g. a Grid Spacing value of 100 and a Subdivision value of 5 will yield a subgrid with a 20 units step.
This option prevents the automatic replacement of glyph names. This might be of importance where special workflow requirements apply. The option is set in all fonts imported from OTF files and UFOs that are opened with Glyphs for the first time. Deactivating this option does not immediately activate the automatic replacement of names. To activate the automatic naming, pick Font > Update Glyph Info. Attention: this may also invalidate the feature code.
In Font view, glyph variations with name suffixes will stay next to the main glyph if this option is enabled. For example, ‘h.ss16’, ‘h.alt’, ‘h.loclENG’ will be displayed right after ‘h’ instead of being moved to a different category.