Problem with shinyjs widget functionality

Hi,
In my shiny app, user selects radiobutton rb1 and based on choice selectInput sl1 is activated.

fluidPage(

                             titlePanel("Panel 1"),
                             sidebarLayout(
                                sidebarPanel(
                                   radioButtons("rb1", "Select:",
                                                c("Choice 1" = "ch1",
                                                  "Choice 2" = "ch2")),
                                   br(),
                                   selectInput("sl1", "Select:",
                                               c("Selection 1" = "sl2",
                                                 "Selection 2" = "sl2"), width  ='60%'),
                                   width = 4
                                   
                                ),

When user select choice 2 in radiobutton selectinput dissappears using:

 else if (input$rb1== "ch2" ) {   
      shinyjs::hide("sl1")
            
    }

The problem is that when I turn to choice 1 of rb1 selectInput sl1 remains hidden.
How to solve this problem?
Regards