Walking around inside a drawing of a house

I have a Sketchup drawing of our future home provided by a local designer. I can view the outside, including top, and even underneath. However, I have not been able to view the interior of the home. I have explored several options. the “walk” option is grey and cannot be selected. Is there a way to go inside my drawing and explore?

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If you open the file in SketchUp Free instead of SketchUp Viewer, you can use the walk function and many more functions.
You would have to create a Trimble account but it’s free…
Go here: https://www.sketchup.com/products/sketchup-for-web

Probably the camera is set to parallel projection.

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Thank you! I switched to “perspective” and I was able to move into the house and look around.