Is there a way in multicharts, to set the resolution of the chart e.g. tick size, range of bar, as a variable in a function/signal in order to optimize this setting?

Locust 

Is there a way in multicharts, to set the resolution of the chart e.g. tick size, range of bar, as a variable in a function/signal in order to optimize this setting?

Nope. You have to set it manually per dataseries on the chart, it can't be adjusted systematically.

Mike