Issue in Object classification pixel based case

[Pampa1996]

Hello,
I have to classify few objects from a tiff file(multiple tiff page) using the ''Object classification pixel based''. But I add the files in both parts (prediction map, raw data). But after that the next option 'Threshold and size filter' is not opening. But 2 days back I did this, but now it is not opened.

Does not show any error. I am not able to use it.

Kindly help me to suggest something.