Looks like a combination of excessive number of sides used for the relatively small radius circles and the relatively huge distance from the origin of the parts of the model. I moved the stove close to the origin and created a scene for it. Then I changed the shown viewport to show that scene and reset the Camera and Tags settings. @Anssi mentioned Untagged being turned off. You should never turn off Untagged.
In your LayOut file you are using Last saved SketchUp view for the viewport scenes. This is not good practice. You should be creating scenes that show the model as you need it displayed in LayOut.
I expect you could manage just fine with no more than 96 sides for the various round parts. 300 sides is a strange value anyhow.
I shall remember the 96 sides suggestion, thank you for the advise. I am a self taught Sketchup practitioner, it helps getting insight from experts such as yourself.
I find there’s rarely ever any need to go above 96 sides for round things. I’ve also found it makes sense to stick with some multiple of 12 for the number of sides. That makes the circle evenly divisible by 2, 3, 4, 6, and with 96 sides, 8. On the rare occasion when I need to divide by something else I use a multiple of that number.
I had that impression. You might want to take some time to go through the tutorials at learn.sketchup.com