You have a scale problem in your model. Everything is enormous. You have a door that’s 20 million inches high, you have a road that’s 19,000km wide. The Earth’s diameter is 12,742 km so you could roll the Earth down that lane without touching the sides.
To tidy up, scale your model down with the tape measure tool. Measure any distance and type the size you think it should be. Say measure a door height then type 6’6 and press enter, confirm that you want to resize the entire model. Pick a dimension you know, like the storey height of a building, or a 12 foot wide lane on the road. There’s still scale issues after this that you could fix. If I scale the whole model down so that a door is 6’6" high, the lanes on the road are only 4’ wide, but it’s a million times better scale-wise.
You can delete the components by looking in the components window. I first purged to get rid of unused ones. If there’s any you want to keep, don’t purge. Right-click and choose “Select Instances” then press delete. As these will have been scaled down so much, their scale will be almost zero.
If they are still components, they’ll be in the outliner window so you can just select them there and press delete. Because of the extreme scaling they are hard to work with and you’d be better just deleting them and bring them in again one at a time. Open in a separate file first to see if they are a reasonable scale.
I’ve purged all the components and materials, etc. It’s now only 2.5MB instead of 45MB. If you don’t like what I’ve deleted you can delete them one at a time yourself.
Final Project UP357 Site_gm.skp (2.5 MB)
This is similar to this thread:
Did your teacher give you a file with everything drawn to the wrong scale?