Default value for Approval task in Flexi Task Responive Form

no, you can not set a (default) value for a decision control.

what you could do is to connect save/confirm button to the Decission task list field and configure its return value to a value of your single decision option.

Thanks Martin,

I configured the OK button as bellow but can't figure out where I was wrong as the flexi task is still in progress:

Decision is under task Colum.

I also tried this one and got same behavior:

Any idea?

Hi, 

usually the decision field asks for a numeric value (default Approve/Reject are 1 and 2 - or viceversa, I haven't checked), any custom outcome will have a different value (you can check at runtime looking the decision control, or putting temporarly a calculated value connected to that field, don't look at preview because every outcome will have -1 as value)