Hi there,
I believe you'd to increase the EasySocial sidebar in which by default is set to 220px. Echo template does not have this option to change the width. However, you can create a custom css to override EasySocial styling by placing it in /templates/echo/css/custom.css . Please give it a try.
.com_easysocial #es .es-container .es-sidebar {
width: 400px;
flex: 0 0 400px;
-webkit-flex: 0 0 400px;
-ms-flex: 0 0 400px;
}
Thanks.