Adjust sheet tab area to make more or fewer tabs visible

In Excel 2007, the sheet tab bar and the horizontal scroll bar are placed side by side and is splitted by the tab split bar.

When you place the mouse over the tab split bar, the mouse cursor changes to the split pointer cursor , click and drag towards left to make fewer tabs visible or move towards right to make more tabs visible.
Note:
Adjusting the sheet tab bar area will also resize the horizontal scroll bar.