I used to do this with Google messages (messages.google.com). You would connect, via a QR code, to your phone, then you could read, compose, and send messages through your phone, on your laptop.
Is there a way to do this with the Graphene SMS app? Or perhaps some other SMS app?
Failing that - are there any other decent SMS apps out there - just looking for a larger typing window. The default one shows only 3 lines at a time.