The shared workbook feature is an older feature that has been replaced by co-authoring. For more info, see Collaborate on Excel workbooks with others at the same time using co-authoring.
However, if you still need to use the older feature, you can turn it back on. For more info, see What happened to shared workbooks?
The shared workbook feature is an older feature that has been replaced by co-authoring.
The shared workbook (legacy) isn't currently possible in Excel for the web. You can, however, use share a workbook (legacy) in the Excel desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the Excel desktop app? Try or buy Microsoft 365.