This example runs in Webots 2023b.
Then just run the following
webots webots/worlds/crazyflie_world.wbt
Or open up the world by the menu item file>open world....
You’ll see a crazyflie take off. You can now click the 3d world to make sure it is active, and use the arrow keys on your keyboard to control it. The script in the console should provide further instructions.
If you want something more fun, try out the webots wall following example