Using R Shiny checkboxGroupInput is there a way to remove [1] that appears in the textbox below the checkbox group (See image below for illustration)

I have this code to create a checkbox group:

column(4,checkboxGroupInput("checkGroup2", label = ("Must select one or more Transaction Types(s):"), choices = list("Sale", "Refund", "Exchange"),selected=c("Sale","Refund","Exchange"))

what I get is this:

I want to remove the [1] that shows to the left of the items being selected. Is anyone aware of how this can be removed?

Thank you