If your ads sometimes show up as a 4:5 placement, cropping your 1:1 design, this article will show you how to control this.
If you have the Pro or Global subscription in Confect, you may also solve this by adding a designated 4:5 template into your catalog - meaning that Meta won't have to crop your 1:1 design, and will just use the 4:5 version.
If you just want to stop your ads from being shown cropped, follow the steps in this guide.
Go into your Commerce Manager catalog's "Settings", and find the "Image cropping" options under "Catalogue".
If "Fill frame with image" is selected, Meta may show your ad as a 4:5 and crop the image
Select the "Show entire image in frame" option for "Ads", "Single image ads", and "Product page".
In addition to the cropping settings in the catalog, there are also cropping options on the ad level, that can override the catalog settings.
Find "Creative tools" under "Ad creative" on the ad level, and open the "Image cropping" settings.
To avoid any cropping, you'll want to select "Zoom out to fit".
Next, save this, and publish the ad.
Find these "Advantage+ creative" settings on the ad level, and make sure they are turned off.
Some of these, namely "Advantage+ creative for catalog" and "Background" can create cropping in live ads.
(If you are using the Story catalog function in Confect, only the "Adapt to placement" option may be turned on - all other settings should be off)