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On android there's a "differs along the way" option which let's you split the way.

There is a limit to the type of quest you can fit into the mobile app. It also should have a fall back "leave a note" option.

In this case, the intended flow is that you tap "Uh..." -> "Differs along the way..."

You will then be led to another UI in which you can split the road into several sections.

Aha. If you click 'Uh' exactly on its text, it works. If you click even one pixel away from the actual text, you get the chooser with not enough options.

First-time StreetComplete user here. I just answered a few of these "street has a sidewalk" questions myself. Upon first clicking on one of them, I was able to answer this question for each side of the street individually. The visual selection that you mentioned only applies to one side.

I can tell for sure the current version of StreetComplete for Android does allow specifying that only one side of the road has a side walk. I solved a few of these quests just last week. No idea what's the state on iOS though.