If you don’t want to start with a predesigned layout from a template, you can launch a blank template in Ad Builder to build your ad from scratch. Simply, select Create New Blank Ad from the Creative Library.
Ad Builder will launch a blank template for you to build from the ground up.
Read the directions contained in the left side panel to build out your square master ad size. Open the first scene of your ad or perhaps use the overlay scene to house your first element. Hover over the + icon to add your company logo (a requirement for retargeting ads), and continue to build/tailor your ad to your campaign's marketing goal.
Don't forget to preview how your ad looks like by selecting the eyeball icon at the top of the screen before moving on to your Landscape size!
To read more about the ins and outs of Ad Builder, click here.