code: public DrawerView removeFixedItemById(long id) {
          for (DrawerItem item : mAdapterFixed.getItems()) {
              if (item.getId() == id) {
                  mAdapterFixed.remove(item);
                  updateFixedList();
                  return this;
              }
          }
          return this;
      }
docs: Removes a fixed item from the drawer view
  
  @param id ID to remove