How does someone mirror an object in sketch-up?
Your profile says you are using SketchUp 2020. In that version you can make a copy of the object, right click on it, and use Flip Along.
You can scale it from its center. Value = -1
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With sketchup 2020 right click on the object then select flip along and choose the axis, with sketchup 2023 there’s a new tool to mirror objects.