I am wondering if we can change the symbol color in the line chart or in the bar chart.
One way to achieve this is to create two expressions one with line and other with just symbols. but is there any way we can do this without creating two expression so that the line colour and symbol colour will be different.
I think if you really want a different color between the symbol and the line you will need this kind of workaround with two expressions. But you could adjust the kind of symbol and whose size and also change the widths from the line static (tab presentation) or dynamically per expression, like: if(condition, '<W2>', '<W5>').