Non MS Exchange server settings/setup?

Have a bit of a conundrum, our domain is registered with MS and we will shift to 365 eventually.
We are still using an on premises exchange server and I could always use emclient before.

It appears once I put my email in that it doesn’t want to allow me to manually configure my settings, it defaults to trying to have me login on

Anyway to trigger or get back the old manual option, so I can enter the settings in manually?

Our Outlook 2013 works fine, 365 users have to use a reg tweak for now.