To close the popup when anyone click the subscribe button of a form, please use the popup option “Display as iframe” to ‘No’.
iframe-no
Now on clicking of the subscribe button, the popup will close automatically.
Also in the XYZ WP Pop premium plugin,  there is an option of closing the popup when anyone click on an element in the content.
Popup closing
By properly configuring this option we can close the popup when anyone subscribe to a form or anyone click on an element in the popup content.
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