When I assign the WooComm shop page in WooComm>Settings>Product, the content and the formatting changes, and I can no longer use Beaver Builder to edit the page. Woo is taking control over the page? Is there a theme setting to prevent this, so I can still edit the shop page as any other page? Thanks
Not necessarily a bad thing.
One thing to note is by default the Return to Shop buttons url is myshop.com/shop – this can be changed but you just want to ensure your custom shop page permalink matches that.
What changes are you wanting to make to the Shop page ? Do you have an example