Angular 18 upgrade

projects/demo/app/app.component.ts

@@ -12,6 +12,7 @@ import 'codemirror/mode/clike/clike';
 import 'codemirror/addon/lint/javascript-lint';
 import {PropertiesEditorService} from './properties-editor.service';
 import {dia} from 'jointjs';
+import {setTheme} from "ngx-bootstrap/utils";
 
 @Component({
   selector: 'demo-app',
@@ -36,6 +37,7 @@ export class AppComponent {
     this.renderer = new Renderer();
     this.editor = new Editor(propertiesEditor);
     this.dsl = '';
+    setTheme('bs5'); // or 'bs4'
   }
 
   arrangeAll() {