Preselect flat URLs during Viewport creation

Description

Flat URLs are more stable and usable in the Help Center use case, but many users leave their settings untouched and end up using hierarchical URLs instead, which can cause issues later and can't be changes easily because links to documentation articles have already been shared.
Preselecting flat instead of hierarchical would make sure users who don't care about the URLs initially end up using the better solution.

Environment

None
Fixed

Assignee

Unassigned

Reporter

Sync User [K15t]

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