T250343: Variant tests: D-desktop describes the onboarding dialog being embedded into the suggested edits module when it is not yet initiated. This includes the intro overlay as it exists currently (in variant A), and a modified version of the difficulty overlay as described in T258017: Variant D: difficulty overlay in onboarding.
Once onboarding is complete, the suggested edits module becomes initiated, and is replaced with its regular contents. There's no way to get back to the onboarding flow.
The module should be a fixed height (the height of the suggested edits module) with an internal scroll.