rendering fix after table adjustment

Author: ddooley

lib/DataHarmonizer.js

@@ -359,7 +359,7 @@ class DataHarmonizer {
               callback() {self.context.schemaEditor.saveSchema()}
             },
             preview_schema: {
-              name: 'Preview',
+              name: 'Demo',
               hidden() {
                 return self.template_name != 'Schema';
               },
@@ -1225,6 +1225,8 @@ class DataHarmonizer {
       ...options,
     };
     this.hot.updateSettings({ columns: currentColumns });
+    // updateSettings({columns}) resets HOT's hidden-columns plugin state; re-apply concise view.
+    if (this._conciseViewActive) this.context.toolbar?._applyConciseView(this);
   }
 
   /** Called via Footer.js, and also in right click menu DH contextMenu click