Change record status: 
Project: 
Introduced in branch: 
8.x-3.x
Introduced in version: 
8.x-3.16
Description: 

A new variable dropdown_classes was added to the menu.html.twig template.

This variable allows sub-themes to set additional classes, like dropdown-menu-right to dropdown menus when needed.

The menu--account.html.twig template was modified to implement this.

If your sub-theme has changed either of these templates, you will need to update them accordingly.

Impacts: 
Themers