Is the plugin WonderPlugin Tabs compatible with Elementor page builder https://en-au.wordpress.org/plugins/elementor/?
I tried to add a page created with Elemantor to a tab, the content is loaded correctly, but all the design/styling is lost.
You can try the plugin https://wordpress.org/plugins/anywhere-elementor/.
After you install the plugin, in WonderPlugin Tabs, step 1, click "Add HTML Code", then add the following shortcode to the HTML code.
Please make sure to change the XXXX to the ID of the page that was created with Elementor.