Hello,
No, there is no “settings” page for this plugin.
If you want to display the qr-code by a widget, the generator is used by default.
If you want to display the qr-code in a page, a post, a WooCommerce product or in any public custom post type, the generator is under the administration primary content of your page / post / product.
If the ‘Kaya QR Code Generator’ panel is not displayed, verify that ‘Kaya QR Code Generator’ is checked in the page / post / product options, in ‘Show more tools & options’ > ‘Options’ and ‘Advanced Panels’.
The shortcode generator assistant displayed on pages administration is used to assist on the shortcode structure construction. The generated shortcode must be pasted on a “shortcode block” or directly in the page content.
Thank you, best regards.