Force no default selection in selectInput()

Question

The Shiny documentation mentions that for selectInput():

selected The value (or, if none was supplied, the title) of the naviga

Answer 1

I think you can get around it by adding an empty string to your choice list:

selectInput("app", 
"Select App:", 
choices = c("", as.character(mtrl_name)), 
selected = NULL, 
multiple = FALSE)