Teaser view is one of the ways Drupal displays nodes, in which only the Title and the Teaser are visible.

The teaser contains the first part of the body. By default Drupal's settings control where break between the teaser and the rest of the node occurs. It is possible, however, to set this manually using a special HTML comment tag.

In below, we will discuss about how to get above 2 ways to set Drupal node teaser length happened.

Configure Teaser Lenght

In "Content Management" -> "Post Setting", there is an option for you to set the "Length of trimmed posts", this will be the place for you to control Teaser Length.

Teaser settings (configured in Post settings) are global for all content created after the value is set. To change the teaser length of existing content, each node must be re-saved for the change to be reflected.

Manual Teaser Break

In order to manually set where the point for the teaser and remainder of the body to be split in a post, insert the tag <!--break--> where the teaser should end. Everything before this tag will appear in the teaser. Make sure there are no spaces in the tag or it will be ignored.