I am using Mailbird, and it has 4 columns, as shown in the screenshot below.
First column displays all the email accounts.
Second column displays Folders of the particular email account.
Third column displays a list of emails in each folder.
Fourth column displays Reading Pane for each email.
I tried Mailspring and found out that I can have only 3 columns (first and second columns of Mailbird are merged in to the first column on Mailspring)
Can I display 4 columns in Mailspring too? If yes, how to do so? Please suggest.