I’ve been trying to create a subsidiary page, accessed by drop down menu. A file has been created in accordance with Github /getgrav/grav-theme-antimatter#dropdown-menu. The file …/user/config/themes/twentyfifteen.yaml contains:
enabled: true dropdown: enabled: true current_preset: default
The page exists, and can be accessed by …/main/subpage but there is no drop down menu. The screenshot for the theme implies that it supports drop down menus.
Am I doing something wrong?