It could be that you've clicked the Menu icon, toccoarotary1945.
Once you've clicked the icon, all your tabs on the left will be hidden. This is how your dashboard page looks like:
To get it back, you'll have to click the Menu icon again.
I have article here that you can check in regards to the home dashboard: An introduction to the home dashboard.
I'm always around if you have other concerns with your dashboard page.