Vertex Weight Box List
The list above shows the vertex weight box you created. By toggling the eye icon, you can show or hide the box in the view.
The second check is the "locked" flag, which prevents the face or vertex of the box from being selected.
If you click a list item while holding down the "Ctrl" key, you can make the clicked box fully selected.
The vertex weight box is associated with one of the bones being created, and from the bone configuration below, selecting a bone will only display the boxes associated with that bone.
If you select All Boxes, all created boxes are displayed.
If you want to display only boxes that are not associated with a bone, select Unassigned Box.
If you want to change the bone associated with the box, you can do so by dragging the box to the new bone.
Items in the box list can be reordered by dragging.