Short answer
HubSpot's KB: the new editor works for Shareable link, Email, Workflow and Web page delivery, and supports multi-step surveys and property mapping. Once created there, a survey can't move back to the original editor.
1. In HubSpot
The relevant screen in my demo portal.

2. Worth knowing
Some options depend on delivery method; pick that first.
3. Related
CSAT surveys and survey properties.