"Still" an issue with v7 (I see it is in progress though!). A specific example would be that when you add additional passwords, and you can change the "name" of the field, we use it so that we change password to the name of the account, so we have multiple password-type fields with the username + password in the same entry. In this case also the field name (in our case, the username), gets cut off and there is no way to resize the column.

We would also like to see this functionality developed, +1

I have experienced the same issues with long names, deep trees etc.

It is disappointing for a browser based application, not to be able to resize properly and take advantage of the full page size.