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Hi S Bedard,
On Mac, the Protection tab lives inside the Format Cells dialog, not the ribbon:
- Select the cell(s) you want to check.
- Press Cmd+1 (or go to Format > Cells) or Control-Click (Right-click) and select Format Cells.
- Click the Protection tab: you'll see Locked and Hidden checkboxes there.
Reference: Lock cells to protect them in Excel for Mac
If you're actually looking to lock/protect the whole sheet, that's a separate control: go to the Review tab on the ribbon and click Protect Sheet (or Tools > Protection > Protect Sheet if the ribbon tab isn't showing).
In the Allow users of this sheet to list, select the elements that you want users to be able to change.
For more information, please consult Protect a worksheet in Mac
I hope this provides enough clarity and helps you stay inform with your current situation.
Thank you for your patience and your understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.
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