Configuring EM Client for Homecall

I am helping a friend rebuild a Windows 10 PC that crashed recently.  I re-installed EM Client OK and initially set a tick on the box to Copy messages to the server.  He found that in a few days he was getting problems with the Homecall server quota nearly full, so now I need to modify the configuration and untick the box, so that messages are not copied to server for storage.  But, I went to Tools / Accounts and couldn’t see the tickbox that I thought was there.  Can anyone remind me where I set the configuration so that messages are not copied to the server, please?

As far as I know there is no such setting in eM Client.

If the account is setup as IMAP or Exchange, then all eM Client does is provide a similar environment to using a webmail interface where the messages are stored on the server and eM Client just displays a cached copy of that.

If the account is setup as POP3 then the messages are stored on the computer. There is no way to copy them to the server.