Hide custom collumn

Hello!
Help to hide custom column, please!
I have a table with PDF files in there, and have a “number” collumn.
So, can i add something like th.sorttype, td.sorttype{display:none!important;}
to styles, and hide mu custom collumn. URL of page – http://www.savinova.info/articles

https://ww.wp.xz.cn/plugins/file-away/