cannot select the page(s) for visibility

Under ‘Widget visibility’ I only have the option to select ‘show/do not show’ but there is no option to select the page to show it on. I have tried entering the slug and pageID but the widget does not display on the site page. I don’t think it is a theme compatibility issue because the theme’s tutorial makes the suggestion to use this plugin. I uninstalled the plugin, deleted and started over but still no luck. Any help would be greatly appreciated.

https://wordpress.org/plugins/advanced-text-widget/