In my experience, it just entirely depends on the company. Different companies will use the same title and they can have wildly different mixtures of pre vs post sales involvement. My career has all been customer/client facing technical roles. Titles range from:

- support engineer

- solutions engineer

- sales engineer

- applied engineer

- forward deployed engineer

- solutions / sales architect

- field engineer

And that's leaving out titles that avoid calling someone an engineer who is still entirely technical, has to code, has to deploy, etc. but deals with clients.

I will say though that roles that want pre-sales focused engineers typically are pretty picky about people who have the sales-facing experience. So it shouldn't be too hard to avoid those roles if you're wanting a role focused almost entirely on post-sales.

(I say that, but I do know that if a company lacks pre-sales dedicated engs then other engs definitely can get roped into it. I know a guy with a PhD in ChemEng that basically is the director of research at his company and has had to wear a "sales eng" hat quite a bit in his role.)