How can I reset the view to include the Panel at the bottom of the list of messages?

When the Inbox shows a list of messages, I used to have a sign at the bottom of the pane which had a button 'delete', then I could scroll the screen quickly and remove those that I didn't need to read in its entirety, or does not wish to read in its entirety. This Panel is missing and I would like to get it back.

Thanks in advance for your help

F8 activates / deactivates the preview at the bottom panel. When turned on, there is a button "Delete" for the message.

Tags: Thunderbird

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