使用conditionalPanel创建临时横幅，如果用户导航，该横幅将消失

Question

我想在用户首次打开闪亮网页时创建欢迎消息。目前我拥有它，它不断在第一个tabPanel上。当用户导航然后返回该面板时，有没有办法让它消失？

fluidRow(
  column(width=12,
         tabsetPanel(type = "tabs",  id = "tabs1", 
                     tabPanel("Express Usage", wellPanel("Welcome! Please select the libraries you are interested in viewing from below and use the tabs to navigate between graphs. It is best to limit your selection to no more than 5 libraries at a time"), plotOutput("express_Plot", height=400)),
                     tabPanel("Juvenile Usage", plotOutput("juvenile_Plot", height=400)), 
                     tabPanel("test", h3(textOutput("text_test")))))
  ),