Hello @levacare,
1. In order to delete the sidebar, please navigate to Dashboard > Appearance > Widgets > Shop Sidebar and delete the widgets in it. For reference, please see the image here: https://ibb.co/N2tyZ2H.
2. To solve your issue, please navigate to Dashboard > Appearance > Menus, open the screen options and check product categories. For reference, please see the images here: https://ibb.co/H7NMprf, https://ibb.co/v1x1Djp, and https://ibb.co/kDjpz9c it will allow you to add/insert the product categories to your menu as a menu item.
Best Regards,
8Theme’s Team.