Enable \ Disable selection

I have RShiny code, with which i want to disable/enable number input with checkbox. However, it works only for disable. How could i fix that?

library(shiny)
    runApp(shinyApp(
      ui = fluidPage(
        shinyjs::useShinyjs(),
        numericInput("test", "Test", 5),
        checkboxInput("submit", label="Choose")
      ),
      server = function(input, output, session) {
        observeEvent(input$submit, {
          shinyjs::disable("test")
        })
      }
    ))