Note that if you did select the Draw tool and then the circle from the Draw palette, then you may still see the draw palette. To get rid of that too, simply swipe the cursor one more time out to the right edge.

If for some reasons you appear to be stuck in a tool and swiping away doesn't terminate it, you can hit the ESCAPE key to quit (and usually abort).

After completing this circle, hit the 2 key in order to view the circle from the front. You'll notice in the lower left corner that the numeric input window now shows the name of the object (Curve0). If you want to change it to something more meaningful, just hit the TAB key, and enter the new name like when you enter a numeric value for a tool. I have renamed the object to 'Circle1' in this example.
 
 

 
 

At this point would be a good time to save your current scene. There are several ways to do this. The standard way: The File… menu offers a 'Save As…' or 'Save' feature. You'll be asked for a file name. You can also create a new folder for this exercise if you wish.