It’s an easy process to turn Dashboard back on:
But that doesn’t mean you can’t still enjoy it for now. In that case, the Dashboard environment may just not make a lot of sense anymore. And if rumors are to be believed, some iOS apps, beyond those included with Mojave, may in the future make the jump to macOS. Dashboard widgets, those mini-applications, haven’t seen a lot of activity from developers in quite a while, and most of the widgets for Mac can be replaced with apps from the Mac App Store.
Now, having Dashboard disabled by default may be an indication of what is in store for Dashboard down the road. If you’re a fan of Dashboard and all of its funky Mac widgets, such as weather, an assortment of clocks, a calendar, local movie listings, stocks, and whatever else you may have loaded into the Dashboard environment, the good news is that the Dashboard isn’t really gone, Mojave just turned it off by default. With the advent of macOS Mojave, the Dashboard and all of those productive widgets for Mac are gone.
Dashboard, the secondary desktop introduced with OS X Tiger, is gone, vamoosed, kaput it’s an ex-desktop.