You can easily edit the settings of your chart, such as background color or type of candles in the properties menu of the chart. To open the properties menu, either press F8 on your keyboard or right-click in the chart and choose 'Properties' from the context menu.
After you have made the desired changes, you can save those settings as as chart template for quick and easy access and to apply to other open charts.
To save your chart settings, you can simply right-click in the chart and choose 'Templates' from the context menu. There you will find the option to save and load chart templates.