Search in all namespaces

@Marykutty George 
There are two ways you could do this:

• Create a multi-root VS Code workspace with a folder for each namespace and use the search UI to search all folders.
• Write a method that calls the %SYS.Namespace List query to list all namespaces, then enter each one and call ##class(%Studio.Project).FindInFiles().

First, I presume, the Studio lacks such a functionality because usually each nsp contains independent data. As an example, for each of my customers (applications) I have an dedicated namespace  (of course, you may say, one can allways have an exeption),

and second, if there is no readymade functionality, then make your own. Sometimes it takes longer asking questions or searching the internet then writing a quick-and-dirty "one liner", something like this:

// classdefinitions are stored in ^oddDEF, mac-routines in ^rMAC
// as said above, quick-and-dirty:
// if the SEARCHTERM occurs in %-items, then you will get multiple hits
//
// the one-liner version
k n i ##class(%SYS.Namespace).ListAll(.n) s n="" f  s n=$o(n(n)) q:n=""  f s="^|n|rMAC","^|n|oddDEF" f  s s=$q(@s) q:s=""  w:@s_s["SEARCHTERM" s," ",@s,!

// for folks with less experience
//
ClassMethod SearchAllNSP(searchterm)
{
   i ##class(%SYS.Namespace).ListAll(.n) {
      s n=""
      f  {s n=$o(n(n)) q:n=""
          f s="^|n|rMAC","^|n|oddDEF" {
             f  s s=$q(@s) q:s=""  w:@s_s[searchterm s," ",@s,!
          }
      }
   }
}

It's up to you to left out all those multiple %-items and to add some formatting...

So the bottom line of my answer is: yes, there is a way to search (whatever you want) in one go

Another option (my preferred one) - ensure that source control is used for all namespaces in your instance and simply do the search in your source repository.  Then you not only find the strings you are looking for but also you can easily find the history related to each of those parts of code.

Not with Studio, but if you use VS Code, enable proposed APIs, and create a multi-root workspace with one folder for each namespace then I think you can search across them all.