For some unexplained reason, Apple decided to disable Dashboard by default in MacOS Mojave, and that is nothing more than a travesty. Thankfully, it's easy to do it again. Here's how to restore Dashboard to its fair glory.
For those who are not familiar with the Dashboard, it is a collection of widgets that has ever existed since Mac OS X 10.4 Tiger was broadcast many years ago. Dashboard lets you choose widgets that you can easily access without disturbing other apps or having to launch any apps to do a simple task. Calculators, notes, easy access to the weather and more were perfect uses for the Dashboard. Think about how widgets work on iOS, and you have the right idea.
We're not sure why, but Apple has left the Dashboard to languish, completely disabling it in macOS Mojave. It's a shame because we often think we want to do a quick calculation, for example. Opening the calculator is not difficult, but it is not necessary if you have a counter one click away.
Dashboard is great if your workflow from previous versions of macOS is dependent on it, so here's how to get it back.  Enable Dashboard on MacOS Mojave
To start things, click the Apple logo at the top of the screen and select "System Settings."
With system settings open, click "Mission Control."
Around halfway down the window you will see a Dashboard entry. Click the drop-down menu and select either "As Space" or "As Overlay" depending on your preference. To get the old Mac feeling, we suggest you choose "As Overlay".
If you want to change how you call Dashboard, click the "View Dashboard" box menu at the bottom of the window and select the hotkey you want to use. F12 is standard.
It's all there is. Now that you call Dashboard through your chosen method, you will be greeted by some great widgets, just eager to serve.