Vaadin 14 | Installation - appreciated/vaadin-app-layout GitHub Wiki
Add the following lines to you POM
<dependency>
<groupId>com.github.appreciated</groupId>
<artifactId>app-layout-addon</artifactId>
<version></version>
</dependency>
<!-- Should be there by default
<repository>
<id>vaadin-addons</id>
<url>https://maven.vaadin.com/vaadin-addons</url>
</repository>
-->
mvn vaadin:prepare-frontend