Can't setting the menu like in demo

Hallo, I see the demo of and when I install to my site, I can’t add menu like . When I add to mine like it can’t go to the service section. and I don’t see the documentation too. can you give me advice please ?
Thank you,

Hello there,

I hope you are doing well today.

Pleas ensure that you are using the correct spelling for the link, it should be “#services”.
Could you please provide a link to your website so that I can inspect it?

Best Regards,