I'm trying to create simple application/user settings for my WPF application.

Most answers and tutorials suggest using `Properties.Settings.Default` for this.  

However, `Settings` doesn't exist in my `Properties` namespace.  

There is also no **.settings** file in my project explorer, as [the microsoft documentation](https://learn.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-create-a-new-setting-at-design-time) suggests:

> 
> 1. Open Visual Studio.
> 2. In **Solution Explorer**, expand the **Properties** node of your project.
> 3. Double-click the **.settings** file in which you want to add a new setting. The default name for this file is Settings.settings.
> 
> 
> 

[![Solution explorer](https://i.stack.imgur.com/PuSCB.png)](https://i.stack.imgur.com/PuSCB.png)

Also there is no **Settings** tab in my project properties window, as some (older?) resources suggest.

[![Project properties window](https://i.stack.imgur.com/nwDUP.png)](https://i.stack.imgur.com/nwDUP.png)