How to expand text boundaries in Word 2013?

Feel free to modify Normal.dotm, but you should never replace it with another template that you have renamed to "Normal.dotm."

I found the solution when I restored my custom styles (normal template).

STEP 1: With word 2010 or 2007 (in other pc), go to C:\Users\user name\AppData\Roaming\Microsoft\Templates, copy Normal.docm and keep in a safe place.Then open Templates folder again, copy and replace with Normal.docm you have saved. When you open a blank document in word 2013, the text boundary will show like previous version. However, this Normal.docm is opened in compatibility mode.

This will also restore your custom styles in previous office version

STEP 2: If you want to come back with default text boundary, open a blank document, save it as *.dotm, copy and replace  with Normal.docm you has just created in Templates folder

you won't lose your styles in step 1

I know this idea somehow is as the same as Stefan Blom's but it is simpler and I got luck when finding out the solution.

Hope this works for you.

This is BAD advice. I apologize for being so blunt, but I think it is important that no one follow it.

1. There is no such file as normal.docm naturally. Word has no use for a file with this name. Neither do Word users. The name of the file is normal.dotm. The difference between these two names is huge. If you do not understand it, you should not be giving anyone advice about Word. I understand that you are trying to help, but good intentions only go so far. If they do follow your advice it would not have the desired effect because Word will ignore a file named normal.docm.

Templates in Microsoft Word

2. You cannot take a blank document and save it as normal.dotm to replace the one Word creates on its own and have a fully functioning version of Word. That file is created by Word with a boatload of styles, AutoText and AutoCorrect that are important. Only Word can create a fully functional normal template.
3. You can modify the normal template created by Word as shown by Stefan. For someone wanting to have documents in compatibility mode, this is the preferred solution. Normal Template in Microsoft Word - How to Find or Open the Normal Template.

I found the solution when I restored my custom styles (normal template).

STEP 1: With word 2010 or 2007 (in other pc), go to C:\Users\user name\AppData\Roaming\Microsoft\Templates, copy Normal.docm and keep in a safe place.Then open Templates folder again, copy and replace with Normal.docm you have saved. When you open a blank document in word 2013, the text boundary will show like previous version. However, this Normal.docm is opened in compatibility mode.

This will also restore your custom styles in previous office version

STEP 2: If you want to come back with default text boundary, open a blank document, save it as *.dotm, copy and replace  with Normal.docm you has just created in Templates folder

you won't lose your styles in step 1

I know this idea somehow is as the same as Stefan Blom's but it is simpler and I got luck when finding out the solution.

Hope this works for you.

I hope this is the way to show text boundary with full space to document.

Just change your save option to *.doc then show text boundary will full to your document.

Saving in *.doc format is certainly going to work, but you will of course lose any features specific to the *.docx format.

Instead, what you can do is set your template in compatibility mode (without changing the file format). Make sure that the template is open and active in Word. Hold the Alt key and press F11 to display the Visual Basic Editor. Activate the Immediate window by pressing Ctrl+G. Type

ActiveDocument.SetCompatibilityMode wdWord2010

and press Enter. Close the Visual Basic Editor.

The next step is to click File | Options. At the bottom of the Advanced category, enable Word 2010 compatibility. 

When you are done, save and close your template.