Hi,
That's a filter.
The simplest is to go in the menu Display>Filters and disable that filter. However, since you're using that filter in the filter module at the top, it would also remove it from there.
To only remove it from the top of the menu item, the best is to edit the menu item via the Joomla menu manager. There, under the "products options" tab, you'll find a display option for filters which you can turn off.
