When dashboard is present inside action-button it is showing result when button is pressed twice

#1

In my code when i press load scenario button it is showing the dashboard page when load scenario button is pressed twice.I want my dashboard to appear in a single click.Can anyone help.Here is my code

 library("shiny")
 library("shinydashboard")
 ui <- fluidPage(


  actionButton("create_scenario", "Create Scenario"),
  actionButton("load_scenario","load scenario"),
 uiOutput("input"),
  uiOutput("inputs")
 )

 server <- function(input, output,session) {

  observeEvent(input$create_scenario,{

    output$input <- renderUI({
     textInput("txtInput","Enter Scenario Name","Enter name as scenario         
              (number of senario created +1)")
    })


   })

  observeEvent(input$load_scenario,{

    output$inputs <- renderUI({
     # textInput("txtInput","Enter Scenario Name","Enter name as scenario  
     #(number of senario created +1)")
      dashboardPage(
       dashboardHeader(title = "Basic dashboard"),
       dashboardSidebar(),
      dashboardBody(
      # Boxes need to be put in a row (or column)
      fluidRow(
        box(plotOutput("plot1", height = 250)),
        
        box(
          title = "Controls",
          sliderInput("slider", "Number of observations:", 1, 100, 50)
        ))))
 
  
} )

histdata <- rnorm(500)
output$plot1 <- renderPlot({
  data <- histdata[seq_len(input$slider)]
  hist(data)
    })


  })
}
shinyApp(ui, server)

Please ignore the create scenario button.One more help which is off topic can i add some colour to dashboard as it is not very attractive.

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