> In Action Buttons in CSS OPIs there is an field to ask a Confirm question that will show a dialog allowing the user to cancel an action.
The Boolean Button does have a "Show Confirm Dialog" option, as does the "Boolean Switch" button, but not the plain "Action Button".
> Is there a way to do this in Display Builder Action Buttons?
Yes, for the "Boolean Button", same as in BOY.
For the "Action Button", there isn't, just as there wasn't for BOY.
But there are examples of how to open a warning dialog, how to ask for confirmation, or how to ask for a password in the examples, see /Display Builder/script_util/script_util.bob