Hello,
1) Very likely problem with theme options is caused by third-party plugin WooCommerce Point of Sale and error that it gives in console http://prntscr.com/h87410 Try to disable that plugin and check Theme Options again.
2) Simple theme reinstallation does not allow you to start from the scratch. Yes, theme creates the tables in DB. To start from the very beginning you need to reinstall WP but I’m not sure if this is a good idea if you already have your products there.
Regards