Separating fileInput from radioButtons into shiny code - r

Question

When running the code below, you will notice that I have two options below. If you press the Excel option, a fileInput will appear right below the radioButtons. However, I would like to know if it is possible to separate fileInput from radioButtons. I will insert an image to clarify what I want. See that they are separated.
Executable code below:
library(shiny)
library(dplyr)
library(shinyjs)
library(shinythemes)
library(readxl)
ui <- fluidPage(
shiny::navbarPage(theme = shinytheme("flatly"), collapsible = TRUE,
br(),
tabPanel("PAGE1",
sidebarLayout(
sidebarPanel(
radioButtons("button",
label = h3("Data source"),
choices = list("Excel" = "Excel",
"Database" = "database"),
selected = "File"),
uiOutput('fileInput'),
),
mainPanel(
)))))
server <- function(input, output) {
observe({
if(is.null(input$button)) {
}else if (input$button =="Excel"){
output$fileInput <- renderUI({
fileInput("file",h4("Import file"), multiple = T, accept = ".xlsx")
})
} else if(input$button=="database"){
output$fileInput <- NULL
} else {
output$fileInput <- NULL
}
})
}
shinyApp(ui = ui, server = server)
Example:
I left it in red to specify the space

Answer 1

A possible workaround could be to use fluidRow with two columns to simulating a sidebarPanel with a mainPanel.
Notice that I wrapped the inputs in a div(class = "well well-lg") for the background.
App
library(shiny)
library(dplyr)
library(shinyjs)
library(shinythemes)
library(readxl)
ui <- navbarPage(
theme = shinytheme("flatly"), collapsible = TRUE,
br(),
tabPanel(
"PAGE1",
fluidRow(
column(
width = 6,
fluidRow(div(
class = "well well-lg",
radioButtons("button",
label = h3("Data source"),
choices = list(
"Excel" = "Excel",
"Database" = "database"
),
selected = "File"
)
)),
fluidRow(
uiOutput("fileInput")
)
),
column(
width = 6,
tableOutput("iris")
)
)
)
)
server <- function(input, output) {
output$iris <- renderTable({
iris
})
observe({
if (is.null(input$button)) {
} else if (input$button == "Excel") {
output$fileInput <- renderUI({
div(class = "well well-lg", fileInput("file", h4("Import file"), multiple = T, accept = ".xlsx"))
})
} else if (input$button == "database") {
output$fileInput <- NULL
} else {
output$fileInput <- NULL
}
})
}
shinyApp(ui = ui, server = server)