Google Forms branching planner

Describe your sections and your routing answers; the planner walks every answer's path the way Forms routes a real respondent and shows where each one actually ends up. The editor shows the destinations you set — it never shows the fall-through: every section still runs into the one below it unless its After section dropdown says otherwise, and that is how one audience's page quietly leaks into another's.

Describe the form, then hit Walk every path.

For example, a workshop signup where people attend in person or online:

Sections:            Answers:
Signup page          In person -> 2
In-person details    Online -> 3
Online details

The planner will tell you that in-person people fall through into the online page unless After section 2 is set to Submit form — the defect the editor never shows.

Nothing is sent anywhere but this page, and nothing is stored.

The fall-through, demonstrated

Routing has two halves and the editor only shows one of them. The per-answer destinations sit on the question, in plain sight. The other half is the After section dropdown at the foot of every section, and it defaults to Continue to next section — so a section your branch routes people to still spills them into whatever section happens to sit below it. This was established by publishing a real three-section form and walking it signed out: with After section 2 left on its default, an "In person" respondent was carried straight from the in-person page into the online-details page. Setting it to Submit form is the fix, and it is one dropdown, three sections down from where you were looking.

Three more facts the planner leans on, all verified on a live form. The last section always submits — Forms doesn't even offer it a dropdown. An unanswered routing question routes nowhere — the section fall-through applies instead, which is why the routing question should be Required. And only Multiple choice and Dropdown questions offer Go to section based on answer at all.