what does this symbol mean?

[#1]

The bar and line is a bar and line, but what is the X?

Does that mean, it doesn't appear on the chart?

How to set this, or change it?

[Anil_Babu_Samineni · Accepted solution]

X Mean just for disable the expression. For this report i don't want to work for that expression. We are just disable the expression. If you want to work you may notice right side the Enable option. Use that and check in report. You will came to know for sure