When working in the Online Editor with AEM Preview and the previews has tabbed browsing, clicking on a tab does not display that tab in the preview window.

The AEM Preview does not support linked tabs or any other kind of navigation (as those linked pages are not provided in the preview package delivered from AEM).

Refer to the following documentation for more details:
https://docs.rws.com/870248/1130256/translation-connectivity/aem-preview-in-online-editor