Unless you previously saved the layout (Menu Bar > View > Import/Export) you can't easily get your old layout back. You'll need to tell us, or show us what panels you had where and we can try to help. Or you can go to the panel configuration (little box to the left of the search bar) and move panels around yourself. Once you find something you like, it would be a good idea to save it as I have described.
And while you're saving things, you can save your settings via the Menu Bar > Edit > Saved Settings > Save/Load.