Is there a way to have a dropdown list that gives the user the option to select more than one at a time?

Wondering if there is a way to use selectInput or another drop down menu option to allow the user to select more than one option or even all?

I'd use

selectInput(inputId, label, choices, selected = NULL, multiple = TRUE,
  selectize = TRUE, width = NULL, size = NULL)

where the place to pay attention is multiple = TRUE. In my case I often added a value "All" to my filter which I then handle on the server side to keep all rows of a given df.

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