Connecting between letters issue

[janlou]

Hi, I want to create an Arabic font, but I also have this problem with the created font, the connection between the letters is visible, how can I fix them?
Screenshot:

[Bhikkhu Pesala]

Are the joins visible in the Font Test window at large font sizes?

[janlou]

Are the joins visible in the Font Test window at large font sizes?

No, there is no problem in the preview window at large font sizes, but there is a problem with the small size.
In fact, after changing the font size, the problem changes between the other letters!

[janlou]

The problem was solved by increasing the shape outwards of the metrics.

[Erwin Denissen]

Good to hear you solved the problem!