How to Remove or Clear Recent Documents Photoshop

Hi, 

I have been looking an instruction on the internet and in adobe support on how to remove or delete all these propagating file sizes in the photoshop but I haven't found an answer. I have done clearing all the recent files and unchecking the tick boxes in general but they are still there. I prefer to delete them instead of hiding them if possible. Any ideas on how to do it? Does anyone know how to delete them?