On your dashboard, click on templates:
You can narrow your search down by selecting the specific category you are looking for and 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.
Click on browse found on the top of your page, to have a detailed view of all of the categories.
Once you find what you are looking for, expand it to view the all the sizes and click on the size you are looking to work with:
You can now filter you search even further by selecting the niche and theme of your brand:
You can also browse the templates inside the editor tool by click on browse templates in the left panel on your screen: