Do you want to quickly find out the content of a message? In most email solutions, you can get a preview of emails. Clicking on a message in the list shows the contents of another part of the window. Of course, this feature is also available in Gmail. Activate by going to Gmail Settings> Advanced> Preview window> Activate. Scroll down and save the changes. Your browser will now be reloaded. In the upper right corner, you then choose whether you want your messages to be previewed vertically or horizontally.