Clicked something by mistake and everything went blue and flipped

Please help! I randomly clicked something and my entire model flipped sides and everything went blue…I cant undo, seems like I randomly did something to a setting?! It was maybe two clicks…how can I fix please?
skp file below

1st floor 2d floorplan skp.skp (2.7 MB)

Show us at least a screen shot of what you are seeing. Better, share the .skp file.

Done, thank you Dave

Look in the upper left corner of the model window. Note that it shows you’ve chosen the Bottom view. Go to Camera>Standard Views and choose Top.

Oh wow, I feel rather silly, thank you! Dave to the rescue again!

No worries.

Remember what i told you about tag usage. You’ve got the incorrect tag thing going on again.
Screenshot - 12_2_2021 , 2_14_10 PM

And remember to purge unused stuff.
Screenshot - 12_2_2021 , 2_15_26 PM

A little more than 91% file size reduction.
1st floor 2d floorplan skp purged.skp (246.6 KB)

Oh my gosh…one day I’ll get it! I thought I was doing a little better as I was careful to do more components for all my objects and less tags. Let me purge and review!