n Adobe Illustrator CC (2017), which functional key is used to show and hide the Layers panel?

In Adobe Illustrator CC (2017), there is no specific functional key to show and hide the Layers panel. However, you can use the shortcut F7 to show and hide the Layers panel. Here are the steps:

1. Open Adobe Illustrator CC (2017).
2. If the Layers panel is not visible, press F7 on your keyboard. This will bring up the Layers panel.
3. If you want to hide the Layers panel, press F7 again. This will hide the Layers panel.

Remember, this is a toggle function. So, pressing F7 will either show or hide the Layers panel depending on its current state.