Prevent Entering New Value in co Select Box

I’m using the “co” column type to display a select box.

It works fine, except that it seems that users can not only select from the dropdown but can also type in any value they wish.

How can we limit to the list?

Unfortunately such feature is not supported.
You may try to use the onEditCell event to to control the new typed values and block them if it’s it’s needed:
docs.dhtmlx.com/api__dhtmlxgrid_ … idden.html