Box Content Explorer: Resize Column Widths
Box Content Explorer currently supports dynamically sized columns with the browser window width, but user-resizable columns are needed to accommodate large items' names.
I have this problem too. It's quite frustrating to not be able to expand the column to read the names of the files or folders you're trying to work on if they have long names.
The Content Manager view in Admin Console currently does not resize colums with the browser width and does not let a user resize columns. This limits the ability to view file names longer than ~15 characters. If many files have similar names its impossible to determine what file to look at.