docs: fixed design bug in API reference (#2213)

www/docs/docusaurus.config.js

@@ -216,6 +216,11 @@ module.exports = {
             showObjectSchemaExamples: true,
             requiredPropsFirst: true,
             hideRequestPayloadSample: true
+          },
+          theme: {
+            sidebar: {
+              width: '250px'
+            }
           }
         }
       },