CODE EXAMPLE FOR JAVASCRIPT

Plumsail To change the modal popup window size you can try injecting the CSS to the SharePoint list view page

div.od-Dialog-main {
	width: 900px !important;
	height: 900px !important;
}

.od-Dialog-main--lg {
	width: 900px !important;
	max-width: 1000px !important;
}