The Plugin sets WooCommerce Product fields to display none: this affects the right column of the Product Meta-Box with Stock, Shipping, Linked Products etc.
Your Plugin is great but with this bug we can’t use it ??

Hi,
activating the plugin changes the default admin CSS. Before activating the plugin, the background of every WordPress admin page is gray, when activated the background gets white and font changes.

I think you don’t want this behavior. Please use proper CSS classes (for example add plugin prefix to css classes or wrap them in your custom wrapper).

I also can’t find Settings page of your plugin anywhere.