LocalSettings.php

wfLoadExtension( 'VisualEditor' );

// Enable by default for everybody $wgDefaultUserOptions['visualeditor-enable'] = 1;

// Optional: Set VisualEditor as the default for anonymous users // otherwise they will have to switch to VE // $wgDefaultUserOptions['visualeditor-editor'] = "visualeditor";

// Don't allow users to disable it $wgHiddenPrefs[] = 'visualeditor-enable';

// OPTIONAL: Enable VisualEditor's experimental code features
 * 1) $wgDefaultUserOptions['visualeditor-enable-experimental'] = 1;