Double click to navigate to a cell

I

Isit Ears

Most of us can double click on a cell with a formula in it, and it'll
navigate us to that cell. ie in cell A1 there is a formula "=Z100", so I
double click on A1 and excel navigates directly to Z100

We did this by unchecking Tools>Options>Edit>Edit directly in Cell.

However this doesn't work on all PC's

Any ideas what else could be stopping this from working??

Thanks
 
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