Do you see in your upper left hand corner where it says 100% - that’s where it’s filling your screen with the work area. Your objects are there somewhere, but they’re off the work area. So you can either hold down Ctl and scroll down on your mouse wheel - or click in that box and make it 25%.
Then, click on the Hand icon and move it around until you’re off the side of your work area, then click Ctl-A - which will highlight any art. If you don’t see it, drag it around to the other side - or the top, or the bottom
Then, once you’ve found it, click back to the Arrow symbol, drag the art back into the black area - and re-zoom in so you can see your work area filling the screen.
Hopefully that works
BTW, dragging things off your work area allows them not to be printed even if you have settings entered for them - so it’s a great area to use when you’ve got a bunch of stuff in a file but only want to print one thing. Becoming comfortable with the zoom and pan features will help you in the long run!