Highlighting Anomalies

Dear all,

I am new to the KNIME platform and I am loving it.
I am stuck on a problem which I need help.
Basically, I’m trying to plot anomalies on a scatter plot which already has a colour manager.

The circled points with the x-markers represent what I want to highlight because it is not clear. I would like to change the colour of those points and increase the size of those points only. I tried using an extra colour manager but this overwrites the previous colour manager.

Is there any way to do this?