If I understand correctly, you are referring to the Timeline.
In the Project Panel, you should see your Sequences' Timelines. Dbl-click on the missing one.
If that does not restore it, go to Window>Workspace and Reset the Workspace, of choose on of those installed with the program.
I find it a good practice to Save a Custom Workspace, when you have things arranged as desired. I have about 4 Custom, plus all the installed possibilities.
Good luck, and hope that one of those suggestions gets you back to editing.
Excellent, that is exactly it. Thank you so much!
You are most welcome, and glad that you are now back to editing.
Enjoy the trial, and hope that you find it a very useful program.