What does the Item Master look like in Tc11 after you check it out for edit? Fill-in some of the empty fields on the IM and save/check-in. How does the Item Master look now? Tip: Look for the "show empty properties" at the end of the sheet.
The OOTB behavior is to show each property/value on a separate line sorted alphabetically (upper-case first then lower case). You can create and add your own stylesheet to display the properties as you see fit.