How to add more Whitespace to the Main Panel in Shiny Dashboard?

For vertical whitespace in Shiny, you can go with headerPanel("")

I had the same problem. Putting everything in a fluidRow() fixed it for me...

Can you try to wrap you showOutput with a div wrap?

tags$div(
  style="margin-bottom:50px;",
  showOutput("plot4", "Nvd3")
)