How do I click anywhere in a WPF datagrid cell to begin editing?

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DataGrid

I have a DataGrid that displays various values, some of which can be edited in place when the user clicks on them. This is working fine except for one annoyance: at the moment, I have to click on the actual text already contained in a DataGridCell to begin editing, which sometimes can be a single character and so is difficult to hit.

Is there a way to get the DataGrid to begin a cell edit when the user clicks anywhere in a cell?

What I have tried:

I've found a few bits on the internet that seem to answer this question but I suspect they are out-of-date. For example, I found this statement "When I tested with the DataGrid that comes with WPF 4, I can click on anywhere in the cell," on this web page: wpfdatagrid - How can you set the clickable area of a WPF datagrid cell? - Stack Overflow[^]

... but I am definitely not seeing this behaviour. I am using WPF 4 according to what I see when I follow these steps: https://docs.microsoft.com/en-us/dotnet/framework/wpf/app-development/how-to-determine-the-installed-version-of-wpf