If you're using version 6 or higher and you want to view the Inventory Center's property grid, make sure the option "Use Classic Inventory Screen" is turned OFF. Also, make sure that your Windows's display settings are set to a high enough resolution. Typically 1280 x 960 provides a full view of the Inventory Center. But you can go higher if you prefer, if your computer's hardware supports it.
How to turn off "Use Classic Inventory Screen"
Maintenance tab > System Setup > Inventory > uncheck-mark "Use Classic Inventory Screen"
How to adjust your computer's display settings
Windows 10:
Right click on an empty space on the desktop > Display Settings > Advanced Display Settings > Resolution > Select an available screen Resolution
Windows 7:
1. Right click on an empty space on the desktop > Screen Resolution > Change Display Settings
2. Select the monitor Display you want to change the screen resolution for
3. Select an available screen Resolution