This view is not constrained

To quickly resolve this, use this very helpful shortcut in Android Studio:

Right-click widget-in-question > Constraint Layout > Infer Constraints:

Thereafter, you can tweak the constraints as described here: https://stackoverflow.com/a/37960888/5556250

Update

This is not correct for the Android Studio v3 and up. As per @purpleladydragons’s comment:

“Constraint Layout” is not in the dropdown menu. Use the magic wand icon in the toolbar menu above the design preview; there is the “Infer Constraints” button.

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