From the PREFACE of Lexham Clausal Outlines of the GNT:
"In my work as a seminary professor, there is no resource that students have found more helpful for exegesis than a clausal outline of the Greek text. Because the main verbs are identified within a paragraph, they can immediately see the big picture and not get lost in a forest of details. In order to keep sentences short, English translations frequently make main clauses out of participles and relative clauses prohibiting readers from visualizing the main points of the author. Greek clausal outlines help the readers determine what are the main thoughts of the author and how the dependent clauses fit into the flow of the author’s arguments."
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So ... I just created a visual filter for the main verb in Lexham Clausal Outlines of the GNT.
HOW? It took a little work to get all the occurances, but I think I have it now. [First, open a new Visual Filter and give it a name - thanks, Richard.]
1. I set visual Filter to BASIC.
2. SEARCH all text in Lexham Clausal Outlines as the resource
3. Typed in: "*main verb*" in the search box [that is: quote - asterix - main verb - asterix - end quote]
4. And set formatting to: yellow highlight
Done. It works. 
PS - The statement in the PREFACE was made by :
Dean B. Deppe, Th.D.
Associate Professor of New Testament
Calvin Theological Seminary