("Output Data" are items of an array intended to copy-paste into your C code)
Shift+click => ALL chars
Alt+click => second func.
Click on "Reset char" button with Meta-key (Ctrl on PC, Command on Mac) will generate font shape from the system Times font in adequate size for canvas.
Meta-key + Shift => for all the chars.
Click to ASCII-table for "edit"ing chosen character.
Click with Alt for "copy" content of chosen character to current.
Click with Shift for "add"ing chosen character data to current.
The same functionality for buttons in Output data tab.