How to we display percentage in pie chart SSRS

In BIDS or SSDT-BI, do the following:

1. Click on Report > Report Properties > Layout tab (Page Setup tab in SSDT-BI)
2. Make a note of the values for Page width, Left margin, Right margin
3. Close and go back to the design surface
4. In the Properties window, select Body
5. Click the + symbol to expand the Size node
6. Make a note of the value for Width

To render in PDF correctly Body Width + Left margin + Right margin must be less than or equal to Page width. When you see blank pages being rendered it is almost always because the body width plus margins is greater than the page width.

Remember: (Body Width + Left margin + Right margin) <= (Page width)

i had this same issue, if you just use the arrows (little blue arrows at the top of the chart data box) to move the value to the top of the list you can edit the label details/code/expression etc for that series. then just repeat this for all the values you've added.

i'm sure there's a better way but this worked so that's what i did. It seems that when you are editing a label it is only ever editing the item/value at the top of the list, after you've done your labels then just shuffle them back into the order you wanted them listed