Hi Milan,
To delete more than 15 FAQs at once:
1) set the “Number of items per page” to something high like ‘999’. To find this setting, go to the FAQs list page, then click the “Screen Options” tab in the top right section of your browser window.
2) After the full list is displayed, click the checkbox to the left of the “Title” column header (which will select all the FAQ checkboxes).
3) From there, deselect the ones you want to keep.
4) Then select “Bulk actions” -> “Move to Trash”
5) Click the “Apply” button
Thanks this worked. But all FAQ cards which are empty I could not delete.
Even if I click on each one to delete it, it doenst work. Do you know what I am doing wrong?
In that case, you will need to access your database via phpMyAdmin and delete the blank faqs from there. I recommend making a backup of your database first, as a precaution.
After you have logged into phpMyAdmin, open up the wp_posts table and click on the SQL at the top.
From there you will need to run this query:
https://pastebin.com/A1cU9v4n
EDIT: I was unable to post the query here, so I have shared it with you via pastebin.