How to change the Shop Sidebars
You can several option for your Shop page, for example you can have 2 sidebars, 1 sidebar on the left, other on the right or no sidebars at all.
If you don't want a sidebar, just don't include any widgets on these sidebars.
But if you want to choose other option go to your Admin Panel > Appearance > Customize > Shop Options:
Here you see the 3 option you have to change the sidebars on the Shop Page.