As an addedum, the SobiPro folks sent me this thought to help solve the issue, which they say is in the Focus template:
This is a snippet which adds Bootstrap3 code. The contact button is compatible with Bootstrap 3, but uses at the moment Bootstrap 5 for whatever reason. The script error with using the old jChoosen plugin, which seems no longer there in Joomla 4 will still be thrown. See attachment in my last post. The error is caused by this script:
<script>
jQuery(document).ready(function (){ jQuery('.advancedSelect').jchosen({"disable_search_threshold":10,"search_contains":true,"allow_single_deselect":true,"placeholder_text_multiple":"Type or select some options","placeholder_text_single":"Select an option","no_results_text":"No results match"});
});
Also, the non-existent file system.css is still loaded by the template. This is what the template guys should fix. But if this works now for you, use it.
PS: If they switched to Cassiopeia, they have to use default7 template with Bootstrap 5 in SobiPro. The Bootstrap version of SobiPro should always be the same as of the Joomla template!
I hope you can help me solve this problem
Thank you