On your dashboard, click on templates:
You can narrow your search down by selecting the specific category/niche/theme you are looking for and also by typing the keywords in the search bar below:
In order to view the entire design set of a template, hover your cursor over the template that you like, and click the Show Design Set icon.
You can now select the size and format of your preference and requirements.
You can also browse the templates inside the editor tool by clicking on browse templates in the left panel on your screen: