Using the triangular scale grip . . .
- Select the layout viewport that you want to modify.
- Click the triangular scale grip near the center of the viewport, and click the desired scale from the list.
The scale you choose is applied to the viewport.
Note: With this method, you do not have to unlock the layout viewport, and the border of the layout viewport automatically adjusts to maintain the clipping boundaries of the view.
Using the Properties palette . . .
- Select the layout viewport that you want to modify.
- Right-click, and then choose Properties.
- If necessary, click Display Locked and choose No.
- In the Properties palette, select Standard Scale, and then select a new scale from the list.
The scale you choose is applied to the viewport.
Note: To use a custom scale, enter a scale in the Custom Scale field in the Properties palette.