How to make Subject, Author and Date columns appear in MailSpring

How to create columns or make them appear in MailSpring? Basic columns like Author, Date, Subject, Size etc?

If you change the width of the message list, you’ll see that it switches at a certain point between showing the information in columns (when wider) and showing it in lines in one column (when narrower). Not ideal, perhaps, but I’ve found a setup that has it showing the way I want, and I hope you’ll be able to find something that works for you!