The Block editor has a Widget blocks, allowing you to insert widget in WP content.
Now if you want to insert widgets in an HTML insertion are, The theme has a shortcode that allows you to insert a widget area using the widget area shortcode
The widget area shortcode syntax is found in the guide article referenced above as well as in the Add-Ons page of the Xtreme admin section.
You would first create a per page widget area adding a name for it in the box found at the bottom of Appearance > Xtreme Admin > Main Options > Sidebar & Layout
Once the name added there, the widget area will show up in the Worpdress Widget area page with the name “per page area” followed by the name you created.
You can add all the widgets you want in there like in any other widget area.
Then you can use the widget area shortcode to insert all the content in that widget area anywhere
If you created an are name “myarea” the shortcode will look like
[widget_area area='myarea'