dealing with graph templates - how to scale graphs

Hi,

I’m trying to make graphs more stylish and better understandable.
I have different metrics in one graph, showing i.e. packet loss in % and round-trip-time in ms.
I want to scale the % packet loss fix from 0 to 100. The RTT should be scaled to max.

I can only adjust the left y-axis with the graph template. I could not manage to do settings on the right y-axis.
Why can I only do settings on the left? This should be possible on every metric independent on which axis it is shown.

BR
Horst