如何在tabItem for Shinydashboard中删除列布局之间的空格

library(shiny)
library(shinydashboard)

ui <- dashboardPage(
  dashboardHeader(),
  dashboardSidebar(),
  dashboardBody(
    tabItems(
      tabItem(
        tabName = "tab1",
        fluidRow(
          column(width = 4,
                 # 添加第一列的内容
                 plotOutput("plot1")
          ),
          column(width = 4,
                 # 添加第二列的内容
                 plotOutput("plot2")
          ),
          column(width = 4,
                 # 添加第三列的内容
                 plotOutput("plot3")
          )
        )
      )
    )
  )
)

server <- function(input, output) {
  # 添加服务器端代码
}

shinyApp(ui, server)