Kako nastaviti letter spacing celotnemu fontu?

Se opravičujem za angleščino, sem skopiral svojo objavo na tujem forumu. I'm using Font Forge for creating and editing fonts but I have now ran into a problem. I want to change letter spacing for the whole font project at once. I know how to edit left & right side bearings for the single letters and how to adjust kerning in pairs, but this is not what I want. I want to shrink letter spacing for all letters at once, just like in any vector editing software, where you simply select the text and change "spacing between letters (px)" value.

This is what I want to achieve:

Ja ampak jaz sem želel spremeniti že samo datoteko fonta. Sem ugotovil, tule so navodila če bo koga kdaj zanimalo:

Odpri font z Font Forge

- Element / Font Info / spremeni ime

- Edit / Select / Glyphs worth outputting

- Metrics / Set Width / Scale by %

- File / Generate Fonts / True Type .ttf / Generate