Unable to display Shiny output in specified tabs - r

Question

I am trying to make a simple shiny app that takes information from a csv file and produces a table and two graphs. The content appears to be loading correctly but I can not seem to get the output to go within the specified tab, making the output appear cluttered and difficult to read. Any help is appreciated. Thank you in advance
library(ggplot2)
library(plater)
server <- function(input, output) {
output$table1 <- renderTable({
req(input$file1)
df <- read_plate(input$file1$datapath)
if(input$disp == "head") {
return(head(df))
}
else {
return(df)
}
data <- reactive({
read_plate(input$file1$datapath)
})
})
{output$Plot1 <- renderPlot({
req(input$file1)
df <- read_plate(input$file1$datapath)
ggplot(df, aes(x=Column, y=Row, size = 20, color = "variabley")) + geom_point()
})
}
output$vx <- renderUI({
req(input$file1)
df <- read_plate(input$file1$datapath)
selectInput("variablex", "Select the (X) Variable", choices = names(df))
})
output$vy <- renderUI({
req(input$file1)
df <- read_plate(input$file1$datapath)
selectInput("variabley", "Select the (y) Variable", choices = names(df))
})
output$p <- renderPlot({
req(input$file1)
df <- read_plate(input$file1$datapath)
ggplot(df, aes(input$variablex, input$variabley, size = 20)) + geom_point()
})
}
ui <- fluidPage(
titlePanel("Enrichment Analysis"),
sidebarLayout(
sidebarPanel(
fileInput("file1", "Choose CSV File",
multiple = TRUE,
accept = c("text/csv",
"text/comma-separated-values,text/plain",
".csv")),
tags$hr(),
# Input: Checkbox if file has header ----
checkboxInput("header", "Header", TRUE),
# Input: Select separator ----
radioButtons("sep", "Separator",
choices = c(Comma = ",",
Semicolon = ";",
Tab = "\t"),
selected = ","),
# Input: Select quotes ----
radioButtons("quote", "Quote",
choices = c(None = "",
"Double Quote" = '"',
"Single Quote" = "'"),
selected = '"'),
#Checkbox
# Horizontal line ----
tags$hr(),
# Input: Select number of rows to display ----
radioButtons("disp", "Display",
choices = c(Head = "head",
All = "all"),
selected = "head")
),
mainPanel(
tabsetPanel(type = "tab",
tabPanel("Plot", fluid = TRUE,
sidebarLayout(
sidebarPanel(selectInput("colm", "Variable", choices = names(df), selected = "")),
mainPanel(
plotOutput("Plot1")
)
)
),
tabPanel("Plate"),
sidebarPanel(
uiOutput("vx"),
uiOutput("vy"),
mainPanel(plotOutput("p", width = "70%"))
),
tabPanel("Comparison"),
tabPanel("Table")),
tableOutput("table1")
)
)
)
shinyApp(ui, server )