How can I increase the size of the console inside the code

wish helps you No programming is required. Create a shortcut to your program on the desktop. Right-click it, Properties, Layout tab. Adjust the Width property of the screen buffer and window size.
But you can do it programmatically too, those Windows API functions you found are wrapped by the Console class as well. For example:

    static void Main(string[] args) {
        Console.BufferWidth = 100;
        Console.SetWindowSize(Console.BufferWidth, 25);
        Console.ReadLine();
    }

To fix this issue I've having a very simple WCF service (a console application for file upload). I keep getting error (400) bad request. It works when I upload small files (4kb) but failing for 700kb. , You can set the maximumreceivedmessage programatically like this:

 var binding = new wsHttpBinding(); // or whatever binding you are using
 binding.MaxReceivedMessageSize = Int32.MaxValue; 
 var wcfClient = new WCFServiceTestClient(binding, strServiceURL); 

        WebServiceHost webServiceHost = new WebServiceHost(typeof(UploadService), uri);
        WebHttpBinding binding = new WebHttpBinding();
        binding.MaxReceivedMessageSize = Int32.MaxValue;
        webServiceHost.AddServiceEndpoint(typeof(IUploadService), binding, "WebServiceHost");
        webServiceHost.Open();

To fix the issue you can do If you just need a quick, temporary size bump you can press Ctrl + / - to zoom and Ctrl 0 to reset.

Does that help If I've understood you correctly, you do that with just your mouse. There's kind of a dead-zone between where the code editor stops and the console output starts. If you slowly move your cursor through that deadzone going towards the bottom of the screen, it will change and allow you to click-and-drag to resize the console. The bar to click on is basically hidden, so I understand the confusion.
I couldn't get my mouse to be captured correctly in the screenshot, but it's approximately where the cursor seems to be in my attached screenshot

help you fix your problem I have performed a multiple comparison test in R and when I print the results, I can only see the results of 1000 rows. However, I need to see the whole outcome. My test is time dependent and I have 100 time points of 6 different measurements. You can find an example screenshot of the output from my console, which only shows the result from time point 45 to 100 but not the time points before.

summ <- summary(Tukey[[2]])

summ[1:500, ]
summ[501:1000, ]