Add a new folder in the library files location

Hello every body,

I would like add some new folders in the "library files location" (in the options settings) but I can't because the buttom are not actif.

Is it a limitation for the beta version  or is there any setting to do ?

What is the difference between the folders "drawing files location" and "library files location".

When will be avaible the beta 3 version or the pre-release ?

Thanks for your answer

bruno