How can I get the width of a single char?

MIT App Inventor Help
2

Yes, there is only one default font. AFAIK there is no way to change that.
Regarding the button, try this: Canvas_ButtonFont.aia (40.2 KB)

grafik
grafik1491×248 40.1 KB

Pressing the button two (multiple) times.

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You can now use custom fonts, like e.g. Material icons │ nb191