[adengler]

I'm still learning SW myself, but I'll offer a suggestion since I have encountered similar problems in the past.

Since the orientation of the first component in an assembly is always fixed by default, changing the orientation of that component will cause the entire assembly to change orientation. Here's how to do that...

In the Feature Manager (left side of screen by default), right-click the first component in your assembly. From the drop down menu, select FLOAT. This allows you to move or rotate the component freely. In your case, click the top face of the component and create a mate to the top axis. When the mate is complete, right-click the component again in the Feature Manager, and select FIX from the drop down menu. This will lock the component (and, thus the entire assembly) in the new orientation.

Test the new orientation by viewing in Isometric or Trimetric. Your table should now appear upright.