Studio 2021 Project list suddenly disappeared

Windows 10, Studio 2021 SR2

My projects list suddenly disappeared. There are no filters, and I can find projects using “Open Project”, which shows the projects in File Explorer. When I click on the sdlproj file for a project, this then appears in the new list. It’s not a major obstacle so far, but It’s very disconcerting.Any ideas or suggestions, please?

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