Drag the edge to the left to make the column narrower or to the right to make it wider (or double-click to adjust the width to the longest visible entry in the design grid).
Notes
To adjust the width of several columns at once, select the columns by dragging across their column selectors, and then use the preceding procedure.
Adjusting column widths in Design view or in the Advanced Filter/Sort window has no effect on the column width in the query or filtered datasheet.