You are in what is called 'Card View' - to switch to table view, - if menu bar is not shown, press alt key - then click view>layout and tick message list header - a 'quick filter' button with a small icon should appear above message list pane - click the small icon to the right of quick filter button and select table view

Thank you.

I tried to respond by clicking on the "Mark it solved" button in your message but I just got a blank page in Firefox - URL:

https://support.mozilla.org/en-US/questions/1453980/solve/1663474?watch=qVDfYPLvBg&utm_campaign=questions-reply&utm_source=notification&utm_medium=email

You're welcome. And it was properly marked.  :)