In the Mac OS, press Control, and click in the Acrobat window.
In Windows, right-click in the Acrobat window.
In the selection menu, click one of the following menu items:
Select all objects of type
Select all objects using Screen
Select all objects using Calibration Curve
To clear the selection list and return the page to the default screening, click Deselect all.
A selected item appears highlighted with the color you specified in the Adobe Acrobat Preferences menu.
To add more items:
In the Mac OS, press Control+Shift+click to display the selection menu, and then select a menu item.
In Windows, press Shift+right-click to display the selection menu, and then select a menu item.
This adds to the already-accumulated selection list in the Properties Editor.
To remove a selected item from the selection list using the selection menu, display the menu again and Shift+click on a menu item to clear that selection.