When set to true, this option enables text selection in grids by adjusting the following default grid behaviors:
Text selection will be enabled when row selection is used. By default, text selection is disabled when the row selection feature is used.
Cursor focus will not automatically go into the first available input box when a row is clicked. This happens by default, but the browser clears text selection when an input box receives focus.
pui["grid text selection"] = true;
Where do you save this configuration option? Here