The form design that results from an imported PDF file depends on the different combinations of options that you selected during the import process. If you are not satisfied with the initial conversion, you might want to experiment with different combinations of options to achieve the best results, or you can edit the objects in the form design by using the Object Editor.
Initially, object boundaries appear in the form design so that you can see how the PDF file elements, especially text, have been grouped into objects. This can make the form design look busy and difficult to read. Using the Object Boundaries command in the View menu, you can hide the object boundaries while you examine the form design. You will find the object boundaries useful if you need to make changes to objects in the form design. For example, you use the object boundaries as a guide when you resize or move objects without borders. Also, if a body of text is divided over two or more objects in the form design, the object boundaries will show it. You can easily merge these objects into one text object by using the Merge Selected Text Objects command in the Layout menu.
Title and instruction text may be divided into multiple text objects and field objects. You can create a caption for a field object that does not have a caption by merging it with a text object using the Merge as Caption command in the Layout menu.
You might also find the locking commands in the Edit menu useful. Locking objects prevents you from selecting and editing them in the Layout Editor. For example, you can lock text so that you must double-click the required text or caption to edit it. This makes it somewhat difficult to modify the text. You can also lock static objects such as text, lines, images, and shapes, and you can lock field objects.
See also 

Reviewing the results of a PDF file import