As far as I know the new API does not have that capability out of the box. But no worries, you can implement it by adding a custom action to the popup.
See the example I made for you to get an idea.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<title>Popup actions | ArcGIS API for JavaScript 4.18</title>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<link rel="stylesheet" href="https://js.arcgis.com/4.18/esri/themes/light/main.css" />
<script src="https://js.arcgis.com/4.18/"></script>
<script>
require(["esri/Map", "esri/layers/FeatureLayer", "esri/views/MapView"], function (
Map,
FeatureLayer,
MapView
) {
const map = new Map({
basemap: "gray-vector"
});
const view = new MapView({
container: "viewDiv",
map: map,
center: [-117.08, 34.1],
zoom: 11
});
const toggleFullScreenAction = {
type: "toggle",
title: "Full Screen",
id: "toggle-full-screen",
className: "esri-icon-maximize"
};
view.popup.actions.add(toggleFullScreenAction);
const template = {
title: "Trail run",
content: "{name}"
};
featureLayer = new FeatureLayer({
url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/TrailRuns/FeatureServer/0",
outFields: ["*"],
popupTemplate: template
});
map.add(featureLayer);
function toggleFullScreen() {
if (!document.fullscreenElement) {
document.getElementsByClassName('esri-popup__main-container')[0].requestFullscreen()
.catch(err => {
alert(`Error attempting to enable full-screen mode: ${err.message} (${err.name})`);
});
} else {
if (document.exitFullscreen) {
document.exitFullscreen();
}
}
}
view.popup.on("trigger-action", function (event) {
if (event.action.id === "toggle-full-screen") {
toggleFullScreen();
}
});
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>
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