In some cases, you would not want your users to copy text from the grid. To set this up, you need to go to:
Go to the Tables section of your portal or shared view
Click on the table
Check/Adjust the following settings either at the table level, or the view level, depending on whether or not your views are set to inherit default view settings (under View Type in each view's settings).
View Type must be set to Grid
Go to the User Actions section
Disable the Copy text on grid toggle