Workbench facets or boxes are missing. Can I add them?

In the meantime, workbench facets (boxes) can be moved and minimized, but can't be removed completely by users. Please scroll down as the box might have been moved to the bottom.

Please note that some facets are dynamic and will only be added if there are at least 2 or more variations. Examples of these filters include Main language, Publication types, Journal, Authors and Year.