Rshiny APP：如何充分利用窗口

在我的R/SHINY应用程序中，我将在主面板中有一个侧边栏面板和一个由四个Well面板组成的网格.如何强制应用程序使用整个浏览器窗口？每行中的井面板的宽度总计为12，这是shiny 布局网格中的最大屏幕宽度.我遗漏了什么？

下面是一个小例子:

ui <- fluidPage(
  
  # Application title
  titlePanel(
    span(
      span("Stackoverflow example app"),
      span(tags$h4(actionLink("contact", "Contact us")),
           style = "position:absolute;right:2em;")
    ),
    windowTitle = "Stackoverflow example app"
  ),
  
  # Sidebar with a slider input for number of bins 
  sidebarLayout(
    sidebarPanel(
      width = 2,
      sliderInput("bins",
                  "Number of bins:",
                  min = 1,
                  max = 50,
                  value = 30)
    ),
    
    # Show a plot of the generated distribution
    mainPanel(
      # Show a plot of the generated distribution
      mainPanel(
        tagList(
          fluidRow(
            column(6, 
                   offset = 0,
                   wellPanel(
                     plotOutput("distPlot")
                     
                   )
            ),
            column(6, 
                   offset = 0,
                   wellPanel(
                     "Panel 2"
                   )
            )
          ),
          fluidRow(
            column(6, 
                   offset = 0,
                   wellPanel(
                     "Panel 3"
                   )
            ),
            column(6, 
                   offset = 0,
                   wellPanel(
                     "Panel 4"
                     
                   )
            )
          )
        )
      )
    )
  )
)

# Define server logic required to draw a histogram
server <- function(input, output) {
  
  output$distPlot <- renderPlot({
    # generate bins based on input$bins from ui.R
    x    <- faithful[, 2]
    bins <- seq(min(x), max(x), length.out = input$bins + 1)
    
    # draw the histogram with the specified number of bins
    hist(x, breaks = bins, col = 'darkgray', border = 'white',
         xlab = 'Waiting time to next eruption (in mins)',
         main = 'Histogram of waiting times')
  })
}

# Run the application 
shinyApp(ui = ui, server = server)

And a screenshot: