ENGCOM-5128: [Backport] Fixed Issue #22640 #22908

 - Merge Pull Request #22908 from maheshWebkul721/magento2:2.2-develop-PR-port-22655
 - Merged commits:
   1. e5b5bc1
   2. ae9fa79
   3. a2fc106
   4. 6fc7d7a

Author: magento-engcom-team

app/code/Magento/Tax/Block/Adminhtml/Rate/Form.php

@@ -17,6 +17,8 @@
 use Magento\Tax\Controller\RegistryConstants;
 
 /**
+ * Tax rate form.
+ *
  * @api
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  * @since 100.0.2
@@ -110,7 +112,7 @@ public function __construct(
     }
 
     /**
-     * @return void
+     * @inheritdoc
      */
     protected function _construct()
     {
@@ -119,6 +121,8 @@ protected function _construct()
     }
 
     /**
+     * Prepare form before rendering HTML.
+     *
      * @return $this
      * @SuppressWarnings(PHPMD.CyclomaticComplexity)
      * @SuppressWarnings(PHPMD.NPathComplexity)
@@ -132,8 +136,9 @@ protected function _prepareForm()
             if ($taxRateId) {
                 $taxRateDataObject = $this->_taxRateRepository->get($taxRateId);
             }
+            // phpcs:ignore Magento2.CodeAnalysis.EmptyBlock
         } catch (NoSuchEntityException $e) {
-            /* tax rate not found */
+            //tax rate not found//
         }
 
         $sessionFormValues = (array)$this->_coreRegistry->registry(RegistryConstants::CURRENT_TAX_RATE_FORM_DATA);
@@ -176,7 +181,10 @@ protected function _prepareForm()
         }
 
         $legend = $this->getShowLegend() ? __('Tax Rate Information') : '';
-        $fieldset = $form->addFieldset('base_fieldset', ['legend' => $legend, 'class' => 'form-inline']);
+        $fieldset = $form->addFieldset(
+            'base_fieldset',
+            ['legend' => $legend, 'class' => 'admin__scope-old form-inline']
+        );
 
         if (isset($formData['tax_calculation_rate_id']) && $formData['tax_calculation_rate_id'] > 0) {
             $fieldset->addField(