There is an easy way to avoid switching the price chart style back and forth if we want e.g. to display a candlestick chart for our stock symbols, but a line chart for just a subset of tickers in our database (e.g. mutual funds).
To achieve that – we need to set Continuous Quotations option to No in Symbol->Information window for the symbols that have only one price fixing per day (only close price available).
Then – if we choose View->Price Chart Style to Auto – the chart will automatically use Line style for all symbols that have Continuous quotations option set to No. Other symbols will still use Candlesticks chart style.