You can find WooCommerce Trending Products Popups settings in following location;
Wp-admin menu > Upsell Product Settings

 

Popup Upsell period Settings

You can find WooCommerce Trending Products Popups Periods settings in following location;
Wp-admin menu > Upsell Product Settings > Upsell period:

You can set with it custom date like below example.

Popup Upsell Products filtration

You can find WooCommerce Trending Products Popups Products filtration settings in following location;
Wp-admin menu > Upsell Product Settings > Include Orders With Status:

Wp-admin menu > Upsell Product Settings > Include Products:

Wp-admin menu > Upsell Product Settings > Sort By:

Wp-admin menu > Upsell Product Settings > Report Fields:

 

Custom CSS

Using WooCommerce Trending Products Popups you can even add custom CSS without editing any theme file from the following section.

 

Exclude Free Products

If checked, order line items with a total amount of zero (after discounts) will be excluded from the report calculations.

Show Only The First Products

Select the number of products that you would like to display.

Popup header label and Tab Menu Label and its position

This will be displayed at the top and bottom of browser window see below example.

Like Example below.

 

Select Pages

You can show pop your selected pages.

like below example.