After clicking the "Home">"Crop" button, you will get the pop-up "Set Crop Box" dialog. Here you can drag the eight blue squares in the dashed box to adjust the cropping area. You can also enter the accurate parameters in the Crop Margin area. Then select the Page Range that you want to crop, and finally, click the "Apply" button to crop.
Alternatively, you can access the Crop tool from the Page tab and adjust crop settings accordingly.
You can adjust the visible page area using the Page Boxes tool and the Set Page Size dialog. In addition, cropping pages can help you create consistency within a PDF composed of pages of different sizes.
The Set Page Size dialog box contains options for cropping pages. The Margin Control options are as follows: