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You've hidden everything. Try pressing "Tab" or else click the triangles at the left, right, top and bottom margins of the window.
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Actually, "Shift-Tab" might do better - the shortcut to Hide/Show all panels. Tab just hides/shows the side panels, but you have the top and bottom hidden as well.
Another one to keep in mind is F5, which shows/hides the module picker.
https://helpx.adobe.com/lightroom-classic/help/keyboard-shortcuts.html