You cannot do this for the "Software Overview" page, which is automatically generated. Changing the behavior of automatically generated pages would require additional manual changes to your installation, which we do not support. Such changes may cause problems during upgrades.
You can however, as sadhana pointed out, modify the built-in report "Software: All installed software" or create a report of your own. Note that removing the version field from the report will also remove the links that point a software package to a list of machines it's installed on.