Try going to Window on the main menu, then workspace and select "reset workspace". Let me know if that solves the problem.
You can also select different workspaces in the menu. I beleive the default is "essentials". It could be that you were using one type of workspace, and accidentally changed it to another. I would suggest changing it back to essentials and see if that looks familiar. If not, you can experiment with the other workspace styles until you find the one that suits you, or customize it to your likeing.
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