Left pane was 2 lines, from and subject, now 1

My left pane used to show the sender on line 1 and subject on line 2.
I made an error and now “from” and “subject” appear on 1 line.
How do I go back to 2 lines in left pane

Im not sure if this is what you mean, but you can adjust the vertical size of what shows in the Subject line, by going to “Menu / Settings (Preferences) / Mail / Read” and clicking the “Message Preview” field as per below example screenshot below.

If the amount of subject lines preview is not what you are referring to, can you do an example screenshot of the problem. Blank out anything personal.

eM Client Read documentation support page

https://www.emclient.com/webdocumentation/en/10.0/emclient/default.htm#Settings/Read.htm%3FTocPath%3DSettings%7CMail%7C_____1