Once you dropped the template from the viewer to the browser, it not right clicking, but inside your browser, you have to scroll horizontal, through all the different tabs, such as media start, media in, aspect ratio and so on.
You have to scroll quiet a bit to the right, then you will see the column: Anamorphic. Click on it to check that box, now drop your template from out browser back on the timeline, and it’s 16:9.