In the column label area (labelled A, B, C, etc), position the cursor over the right-hand boundary of the column whose width you want to change. The cursor changes to a double-headed arrow.
Drag the boundary to where you want it to appear and release the mouse button. The column resizes.
To set column width by specifying an exact value
In the column label area (labelled A, B, C, etc), position the cursor over the column whose width you want to change.
From the right–click menu, select Column Width. The Column Width window opens.
Edit the existing entry to display the desired column width.