To protect the document structure, follow these steps:

1.Open the Manage protection pane in one of the following ways:

•On the Protection tab, click Protect structure.

•When working in macOS, you can also run the Data > Manage protection > Protect structure command from the command menu.

2.On the Spreadsheet structure tab:

•If necessary, set a password to remove protection from the document structure.

•Click Protect structure.

3.Close the Manage protection pane in one of the following ways:

•At the top of the pane, click .

•On the Sidebar, click Manage protection.