First thanks for using our theme Airi Pro!
Regarding single page scrolling, please follow my instructions below:
Go to Appearance > Customize > Menus > Select your primary menu and create a new Custom Link item like the image below:
Edit the page with Elementor and give set the ID you defined in step 1 in the desired section (in this example I am using the “Services” section):
At this point, when you click in the Services menu item, the page will scroll until the services section.
but I also wanted to add a hamburger menu to the right of the top menu to be able to access the additional pages on the website.
Unfortunately have an hamburguer menu is not possible. But I have a suggestion for you, instead of hamburguer menu you can create a simple menu with sub-menus, like you currently has in your website at the Work With Me menu.
We hope this helps!
Please try that and let us know if you need further assistance.