PDF Studio can highlight all fields in the form, making them easier to locate. When highlighted a light colored box will be placed over each field within the document. This option is enabled by default but can be turned off or back on by doing the following.
Note: Hidden fields will not be highlighted in the document. To view hidden fields you will need to be in Creating PDF Forms mode.
Select View Tab > Highlight Fields from the menu. The same step will toggle the field highlights off.