How do I remove the sidebar from my shop or shop category pages?

For your Shop page, navigate to Pages>Shop>Edit and scroll down until you see the following:

And select the format with no sidebar (or any format you’d like)

For your Shop Categories, navigate to Products>Categories and edit the category you’d like. Look for the area just like the screenshot above and select the format with no sidebar.

You can also edit this on a per product bases as well.