How to output my uploaded text in Shiny in R at the position of the screenshot?
In your code you use the Sidebar layout which allows only two columns, instead you should use the grid layout to position your elements where you want them, see https://shiny.rstudio.com/articles/layout-guide.html.
You probably need something like this (not tested):
ui&lt;- shinyUI(fluidPage(
  fluidRow(
    column(3,
      # content left 
    ),
    column(5,
      # content centre
    ),
    column(4,
      # content right
    )
  )
)