I have completely filled out the database linked to the dynamic page and I can not get the section under “Which item” to register any options. All of the anchors are linked on the dynamic pages and they also have anchor menus that work correctly.
You should follow the instructions in the article and make sure that you are choosing the right page in the dropdown:
https://support.wix.com/en/article/linking-to-a-dynamic-page#linking-to-an-anchor
If you are still experiencing the issue when following the article - you can submit a ticket so we can take a look at your Editor:
https://support.wix.com/en/article/contacting-wix-customer-care-for-support