Grouping - + and - not showing attop of sheet.
 

Hi,

I am grouping colums in a worksheet. I have three lots of groups - two of
them are fine and show a minus at the end of the group anda plus if I have
hidden the group. However the third (which is in the middle but had the same
problem when it was the second group of two) shows the lines but no minus
sign. I can click on the line to hide the group but no plus sign shows so
you cannot see that columns are hidden. I have to click on "2" to show
everything but if someone else uses the sheet they may not be aware of this.

Can you help please?

Thanks