To showcase your layout template properly, you must provide a thumbnail preview for it. Without this, no one will know the design of the layout. Follow these steps to provide a thumbnail preview for your layout template:
Navigate to the layout template’s
docroot/folder. If you bundled the layout template with a theme created with the Liferay Theme Generator, the thumbnail is located in your theme’s
Create a custom thumbnail PNG inside the folder specified in step 1 with the same name as the layout template that is 120 px x 120 px . Delete the temporary thumbnail PNG file if it exist.
Deploy your layout template to your app server to use it. If your layout template is bundled with a theme, it deploys when the theme is deployed. Now you know how to create a custom thumbnail preview for your Liferay DXP layout templates!