If you get this error for admin-ajax.php in Console of the browser please check do you have some firewall or some security (some plugin or turn on mod_security) on a server that causes not finding WordPress native file admin-ajax.php, that we used for ajax calls.
The 403 Forbidden error is an HTTP status code which means that accessing the page or resource you were trying to reach is absolutely forbidden for some reason. Our suggestion is to check your server log and see if there are some errors and also if you have some security plugins please try to deactivate it and see if it will work after that. Also, check if the mod_security is turn-on on your server.
In order to show column filters in a table, you have “Render advanced filter” option where you can choose options “In the header” and “In the footer” on the wpDataTables Settings page.
If you need to show column filters outside of the table you can do that with option Filter in form. To use it you need to go to the “Sorting and Filtering” tab in the table settings, first enable “Advanced column filters”, and then enable the “Filter in form”.
“Advanced filter in a widget” (in WordPress sidebar) is one more way with which you can use column filters outside of the table. This way you can define the region of the page where to render the filtering form. More about this and about Advanced filters you can find on this link.
This can be changed from “Number format” drop-down menu in the wpDataTables Settings page.
Display date format of a date column can be changed in wpDataTables Settings page from “Date format” drop-down menu.
Display time format of a time column can be changed in wpDataTables Settings page from “Time format” drop-down menu.