Hi @PerumallaNagashivani,
This seems to be a limitation with pivot tables. For some odd reason, when you go to format the visual and expand the ‘headers’ section; adjustments can be made from the column section. It allows the background color to be changed for that cell (much like your example) but the outline section omits that cell.
I’ll go ahead and mark this as a feature request as it would be nice to be able and change!
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