Hi Si-boneGFX,
The option to "Clear recent" is removed with the version 18.011.20063.
This is an as designed behavior.
However, you can still delete multiple PDFs from the recent list.
When you open the application and go to Home > Recent, you can select multiple files to delete them once.
Select the files from the list and click on "Remove from recent" option provided at the right-hand side of the window.
Would like to inform you that if there is a shared file in the recent list, the option to "remove from recent" will not appear.
In that case, you need to uncheck the shared files from the recent list, then the option will reappear to remove the files from recent.
Hope that answers your query.
Let us know if you have any questions.
Regards,
Meenakshi