Gmail allows the users to use the preview pane in Gmail and for that, all you have to do is to-
· Go to Gmail on your PC and click on Settings to see all settings
· Choose the Inbox tab and scroll to the Reading pane
· Check the box that says ‘Enable reading pane’
· Choose the split pane mode to “No Split” appears right of the inbox
· Click on Save changes appears at the bottom
Here you are all done with the procedure to use the preview pane in Gmail and in case, if you can’t able to do so then, contact Gmail Support UK for help regarding the same.