Creating page is easy with Flowershop.
By default, page does not have sidebar and displays the editor content. (Like it should being it WordPress powered page.)
However, to customize it and make it look modern, you can use the page meta section on bottom of the page.
Page metas look like below, and every setting has the description written. All pages theme comes with, were made using this setting panel, so you can analyze those pages to get the idea. Again, feel free to contact support in case you need help.