When I click "browse" my table of portfolio, there's a warning sign says
This table does not contain a unique column. Grid edit, checkbox, Edit, Copy and Delete features are not available.
here's the picture:
But in the table of "users", there is no such warning sign, and there's a area in the beginning of each row, with a checkbox of edit, copy, and delete.
What should I do to let my table of "portfolio" have the same checkbox in the beginning of each row as "users"?