By default, for the normal slider the plugin will stack the reviews on a mobile device. So if you have 3 reviews in a row on Desktop, then on Mobile it will become 3 reviews stacked. There are 2 options to change this behavior.

1) You can use this setting to force one review on mobile.

2) You can use the "Advanced" Slider. It automatically adjusts the number of reviews based on screen size.

Correct, there is currently no setting in this plugin for controlling site-wide visibility. That's what I meant when I said..."Sorry, there is no plugin setting..."

Sorry, there is no plugin setting controlling which pages. If you are using the do_action code, you can just add a conditional page check. For example...

if (!is_page(92)){

do_action( 'wprev_pro_plugin_action', 5 );

}

That will show it on all pages but ID 92. You can use multiple pages with is_page. Here is more about it...

https://developer.wordpress.org/reference/functions/is_page/

Normally you would only add the Shortcode for the review template to the pages you want to show the reviews on. How are you adding the reviews to all the pages?