Changes

Moved the fix to ESI class(better fit the purpose)
Fix wording

src/core.cls.php

@@ -183,12 +183,6 @@ public function init()
 			$this->cls('Admin');
 		}
 
-		// Show add/save widget form data
-		if ($this->cls('Router')->esi_enabled()) {
-			add_action('in_widget_form', array($this->cls('Admin_Display'), 'show_widget_edit'), 100, 3);
-			add_filter('widget_update_callback', __NAMESPACE__ . '\Admin_Settings::validate_widget_save', 10, 4);
-		}
-
 		if (defined('LITESPEED_DISABLE_ALL')) {
 			Debug2::debug('[Core] Bypassed due to debug disable all setting');
 			return;

src/esi.cls.php

@@ -45,11 +45,19 @@ class ESI extends Root
 	 */
 	public function init()
 	{
+		$esi_enabled = $this->cls('Router')->esi_enabled();
+
+		if ($esi_enabled) {
+			// Show add/save widget form data
+			add_action('in_widget_form', array($this->cls('Admin_Display'), 'show_widget_edit'), 100, 3);
+			add_filter('widget_update_callback', __NAMESPACE__ . '\Admin_Settings::validate_widget_save', 10, 4);
+		}
+
 		/**
 		 * Bypass ESI related funcs if disabled ESI to fix potential DIVI compatibility issue
 		 * @since  2.9.7.2
 		 */
-		if (Router::is_ajax() || !$this->cls('Router')->esi_enabled()) {
+		if (Router::is_ajax() || !$esi_enabled) {
 			return;
 		}
 

tpl/esi_widget_edit.php

@@ -72,7 +72,7 @@
 	<p class="install-help">
 		<?php echo __( 'Recommended value: 28800 seconds (8 hours).', 'litespeed-cache' ) ; ?>
 		<?php echo __( 'A TTL of 0 indicates do not cache.', 'litespeed-cache' ) ; ?>
-		<?php echo __('Minimum value is 30.', 'litespeed-cache'); ?>
+		<?php echo __('Otherwise minimum value is 30.', 'litespeed-cache'); ?>
 	</p>
 </div>