Missing button 'Sync menu changes' in Advanced Portal Navigation form

[Kasia5]

Hi All

Do you know what can be a reason that I cannot see the button 'Sync menu changes' in Advanced Portal Navigation form?

I only see the view below:

Thanks in advance for help

[JeffreyL3431965]

Are you on the latest version of Employee Center?

[Kasia5]

I think so, how can I check this?