Is it possible to write normal connected Arabic letters in the Text Preview in Glyphs in order to properly fix the kerning and spacing?
Just type and switch to Right-to-Left mode with the buttons in the lower right.
As I was typing certain letters in the Text Preview didn’t appear, like the “Lam-Alef”. However, when I exported the font, it worked well. I think it’s a bug, just letting you know
For ligatures to appear, you need to activate the ligature feature form the button in the lower left.