[Mobile] New Express APP doesn’t support dual language

You're correct. Adobe Express doesn't support mixing Arabic text and a Latin text such as English well. However it is doable, I mean you need to type and delete within the line in order to get an acceptable result.

Having said that, I didn't see your example, however on my iOS device I was able to type both Arabic and English with a bit of fidling around.

We do expect Adobe Express team to enhance Arabic support.