shiny - collapse sidebar while using appendTab

[CER]

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Hi there, I cross post something from stackoverflow (collapse sidebar while using appendTab) as I still could not figure it out.

I try to collapse the sidebar in the new tab once one of the marker in the example is clicked. Sidebar should stay in Main Dashboard tab

Little example app with data

library(shiny)
library(leaflet)
library(shinydashboard)
library(purrr)
library(shinyjs)

pts <- data.frame(
  id= letters[seq( from = 1, to = 10 )],
  x = rnorm(10, mean = -93.625), 
  y = rnorm(10, mean = 42.0285))

ui part with id="Sidebar" for the sidebar element which should be hidden and useShinyjs()

ui <- dashboardPage(      
  dashboardHeader(title = "Test"),
  dashboardSidebar(
    sidebarMenu(id="Sidebar",
                actionLink("remove", "Remove detail tabs"))),
  dashboardBody(
    useShinyjs(), # not really sure where this has to go?
    tabsetPanel(
    id = "tabs",
    tabPanel(
      title = "Main Dashboard",
      value = "page1",
      fluidRow(tabsetPanel(id='my_tabsetPanel',
                               tabPanel('Map1',
                                        leafletOutput('map1')   
                               )))))))

server part where I add an Eventobserver() within the appendTab which should recognize that a new tab is opened and hide the sidebar

###server   
server <- function(input, output, session) {
  tab_list <- NULL

  output$map1 <- renderLeaflet({
    leaflet() %>% 
      addTiles() %>% 
      setView(-93.65, 42.0285, zoom = 6)
  })
  observe({        
    input$my_tabsetPanel        
    tab1 <- leafletProxy('map1', data = pts) %>%
      clearMarkers() %>% 
      addCircleMarkers(lng = ~x, lat = ~y, radius = 4, layerId = ~id)})

  observeEvent(input$map1_marker_click, { 
    clickedMarker <- input$map1_marker_click[1]
    tab_title <- paste(clickedMarker)   
    appendTab(inputId = "my_tabsetPanel",
              tabPanel(
                tab_title,
                fluidRow(                      
                  box('test')
                )))
    tab_list <<- c(tab_list, tab_title) 

    observeEvent(input$tabs == "my_tabsetPanel", { #also not sure if this is at the right place?
        shinyjs::hide(id = "Sidebar")
      })
    updateTabsetPanel(session, "my_tabsetPanel", selected = tab_title)       
  })

  observeEvent(input$remove,{
    tab_list %>%
      walk(~removeTab("my_tabsetPanel", .x))
    tab_list <<- NULL
  })}  

shinyApp(ui = ui, server = server)

Thanks for any input