In the Edit menu, you can edit normal keys, edit compose keys and create user defined keysyms.
Opens an Edit Key dialog box for the selected key. You can define keysyms and modifier state of the key. This command is available when the keyboard edit mode is Normal Layout.Add Compose Key
Opens an Edit Compose Sequence dialog box to add a new compose sequence. You should select both key1 and key2 to generate a new compose key sequence.Edit Compose Key
Opens an Edit Compose Sequence dialog box for the selected compose key. The key1 is selected automatically and you need to select a key2 for a new compose sequence.Remove Compose Key
Removes the selected compose sequence from the list.User-defined Keysym
Opens a User-defined Keysym dialog box. You can define a new keysym in the dialog box.