If you accidentally closed or missing the panel in After Effects, you can easily get it back.
Use the following steps to bring it back:
1- You can get it back easily from the "Window" in the top bar in the After Effect.
2- In the window menu you can see a list of the panels , So locate the panel you want to restore.
3- Click on the panel that you want and missing it then the After Effects will open and display that panel.
4- Choose the place that you want to be in it.