ACP2E-2247: [Cloud] Misleading prompts on Additional Settings section when setting up a Tax Rule:

Author: AnujNehra

app/code/Magento/Tax/Test/Mftf/Test/AdminCheckTaxForDetailsTagExpandCollapseTest.xml

@@ -32,7 +32,7 @@
             <!-- Click expand icon -->
             <conditionalClick selector="{{AdminTaxRuleFormSection.additionalSettings}}" dependentSelector="{{AdminTaxRuleFormSection.additionalSettingsOpened}}" visible="false" stepKey="openAdditionalSettings"/>
             <!-- Check class in selector -->
-            <seeElement selector="details#detailsbase_fieldset .__show" stepKey="seeBox"/>
+            <seeElement selector="details#detailsbase_fieldset ._show" stepKey="seeBox"/>
             <!--Logout-->
             <actionGroup ref="AdminLogoutActionGroup" stepKey="logoutFromAdmin"/>
         </after>

app/code/Magento/Tax/view/adminhtml/templates/rule/edit.phtml

@@ -322,11 +322,11 @@ $scriptString.= <<<script
 require(['jquery'], function($) {
       jQuery('.admin__collapsible-block-wrapper').on('click', function () {
             if(!this.hasAttribute('open')) {
-                jQuery(this).addClass('__show');
-                jQuery(this).children().addClass('__show');
+                jQuery(this).addClass('_show');
+                jQuery(this).children().addClass('_show');
             } else {
-                jQuery(this).removeClass('__show');
-                jQuery(this).children().removeClass('__show');
+                jQuery(this).removeClass('_show');
+                jQuery(this).children().removeClass('_show');
             }
       });
 });

app/design/adminhtml/Magento/backend/Magento_Tax/web/css/source/_module.less

@@ -29,11 +29,15 @@
     }
 }
 
-.admin__collapsible-block-wrapper.__show .admin__collapsible-title.__show:before {
-    content: @icon-expand-close__content;
-    font-size: @collapsible-title-icon__size;
-    position: absolute;
-    right: @data-grid__font-size;
-    top: 2.3rem;
+.admin__collapsible-block-wrapper {
+    .admin__collapsible-title._show {
+        &:before {
+            content: @icon-expand-close__content;
+            font-size: @collapsible-title-icon__size;
+            position: absolute;
+            right: @data-grid__font-size;
+            top: 2.3rem;
+        }
+    }
 }
 //@codingStandardsIgnoreEnd