Hi @myth,
Just add css to the popup screen like below,
div.fullwidthpopup { width: 100% !important; height: 100% !important; position: fixed !important; top: 0 !important; left: 0 !important; margin-left: 0 !important; } div.fullwidthpopup .bubble-r-box , div.fullwidthpopup .RepeatingGroup, div.fullwidthpopup .HTML{ width: 100% !important; height: 100% !important; }