I cannot find the Scatter plot entry in the SCP menu of version 8.5. This tool is documented for 8.3
https://semiautomaticclassificationmanual.readthedocs.io/en/latest/scp_menu.html
which is where the Help button sends the user in 8.5.0
In fact, there is quite a difference between the SCP menu reproduced in the doc and the one that is present
in 8.5.0