Undo error after saving file

I have dragged my walls without realising, then saved and now can’t undo.
Is there a way to fix it?
I have hours of work in the model and assignment due tomorrow, I won’t have time to redo the whole thing so is there a fix please?

Where did you drag your walls? Are they 2D or 3D? What shape are they? Have you worked with groups? With tags?

Thank you for your reply
3D
I am a beginner so not very good with tech aspects, but yes I am familiar with groups.
Not sure what tags are though.
I can add a screenshot once I have worked out how!

Screenshot 2023-12-17 at 08.19.28.pdf (2.3 MB)

Select edges and use Move tool (right arrow to block the movement on the red axis)

Basics of SketchUp at learn.sketchup.com

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