If you want to check the location of various fields in a document, you can enable the option Field names at any time. Write then displays the field names in curly brackets instead of their results – for example, {Print time} for the "Print time" field.
This option can be enabled and disabled on the ribbon tab References (or Mailings or View) | group Fields | Field names. The enabled mode is indicated by the darker gray color of the button.
Alternatively, you can find this setting as the Display field names checkbox in the dialog box by choosing the ribbon command File | Properties on the View tab.
The respective mode, which you have enabled using one of the alternative options described above, is applied there as the setting.
Tip: You can switch the option Display field names even faster using the shortcut keys Alt+F9. The respective mode that you have enabled is also applied here to the button and the dialog box.
In the aforementioned command group Fields (as in the dialog), you will also find an option called Shade fields. If you enable this option, all fields in the document will be grayed out so that they can be more easily distinguished from normal text. The enabled mode is also applied here in the same way.
Note: The two options Field names and Shade fields only affect the current document.