You will need to have the Show Row Indicator ticked. To do this:
From the Ribbon, click Options.
Click User Preferences and then click Grid View Styles.
Click Show Row Indicator then click Save and Close.
This article explains what to do if a user is not able to find the Field Chooser option on table column headings.
You will need to have the Show Row Indicator ticked. To do this:
From the Ribbon, click Options.
Click User Preferences and then click Grid View Styles.
Click Show Row Indicator then click Save and Close.