Not seeing an option to do that. However, if you so desire, you can make the
file itself password protected so users would have a read-only version.

for that go to Tool - Options - Security and add a Password to modify.

"Carsten" wrote:

I need to allow users to expand and collapse groups in a worksheet, that is
protected - ie. I do not want people to be able to change any data.

Is this possible?