for the sake of consistency, I would like to know how to search for a particular term or word on the source or target file, step by step. I can do that in the Word file, but I want to do it on Studio.
I will suppose you have the same version of Studio as I am using, namely Studio 2019.
I think what you want is to filter on a certain term.
What I would do, is as follows:
Go to the Review tab
In the Display Filter segment on the ribbon there is a search field where you write the term you are interested in.
To the left of the search box you see a funnel, where you choose either In Source or In Target.
Then you should be set.
I hope that answers your question.