There are 4 different ways to open a new chart in cTrader.
When in single chart mode, click + beside the last chart tab and select a currency pair. This option is not available in multi-chart view.
From the MarketWatch, select a symbol and click the chart icon to open a chart for that symbol.
From the MarketWatch, select a symbol. Right click at the top of the symbol area and click New chart.
From an open Position, select an open position. Right click on the position area and click Open ... Chart.