The OpenType Designer provides you with an easy to use visual way to edit glyph positionings. In the left pane you see the how the features and lookups are organized in your font, and depending on the lookup type you can edit the properties in the right pane.
The splitter on the dialogue can be dragged to adjust the width of the panes. Double-click the thumb bar (¦) to dock or the script pane when it is not needed or to undock it.
The left toolbar allows you to add, remove, move, rename and change scripts, languages, features and lookups. Most of these functions are also available in the right-click menu when you have selected an item.
*) The order in which feature and lookups are defined is also the order in which they are processed by host applications. This button allows you to move a feature or lookup down so they are processed earlier or later. As soon as the host application has found a match in one of the lookups it will stop processing. This can be useful to create an "override" for kerning pairs for example. Consider a large kern lookup which contains several group-based pairs. If one or two pairs need extra modification, you can add another lookup to the feature and add the "exceptions" before the actual kern table. This way the host application will find the "exception" first and will skip the "wrong" value from the large lookup.
The right-click menu on the left pane also provides some additional lookup specific actions:
The import function allows you to import an OpenType Layout Feature Definition script. If the script contains only a lookup table, the lookup table will be added to the existing lookups. If the script contains script and language declarations, all existing items will be deleted and overwritten.
The export function allows the export of all scripts, languages, features and lookup definitions, including those that are not in use. Group definitions will also be exported. If you want to export only a single lookup table, you can right-click on one of the lookup tables, and select “Export Lookup”. Please note that exporting a single lookup is only supported for Single and Pair adjustments.
Clear subtable will delete all entries of the currently selected subtable, to clear an entire lookup table (including all subtables) use the right-click menu in the left pane.
The settings button will open the Designer Settings