Opacity option not showing on Stamp tool bar

[Paris31808770hkm6]

Hello everyone. 

Two of my photography students are unable to view the opacity changing option in the cloning stamp tool on their photoshop apps on their iPads. 
We have the 16.6 version of the iPads.

Please assist me or give me any suggestions you have.

Thank you !

[Jeff Arola]

What version of Photoshop iOS are they using?

The latest is 4.8 as shown below.

How many icons do they see when the Clone Stamp Tool is selected?