Right, none of the parameters are per symbol. They are all per chart. Chart *may* be associated with a symbol (let's say you double click on a symbol, that brings up a chart, you change some params, close the chart, double-click on the symbol again to bring up the chart, the params that were changed will be remembered).
But if you navigate the charts by typing in new symbol in the chart or using the "linked" feature, then the chart is the chart and its params stay the same, but the symbol changes.