Scenario: 

 When previewing, some details are cut off as below

Root Cause:

If you adjust the margins for the left, top, and right by using mouse movement, some details on the right-hand side will be cut off by the system.

Solution 

1. Click on the grey-colored section in designer
2. Expand PAGE SETTINGS
3. Expand MARGINS
4. Enter the desired margin size for Left, Right, Top and Bottom.

In that case, you won't encounter any issues with the system cutting off details.