Search and replace in Sources

[peterm3]

Hi,

I tried to find some texts in my sources and replace them to another text but I did't manage to make it.
I found the search and replace tool in search tab but it only searches in some dedicated fields and the source related ones are not there.
Is it possible to make it? Why only some selected fields are available in search?
(Heredis2019latestWindows)

Thanks,
Peter