Update: As of June 14 2023, the legacy editor has been retired for all users. See this blog post for more details.
Hey everybody! Overleaf now uses CodeMirror 6, a different underlying technology, to power its source editor. This modernises the editor, supporting our commitment to improve Overleaf and enhance our processes to bring you highly requested improvements and valuable new features even faster. Adopting a new source editor is a crucial step in unifying with our Rich Text editor, allowing us to improve both in parallel.