How would I recreate this in Unreal Engine if every square is about three feet?

I need to reproduce the entire map and every square is about three feet. Where could I find the settings allowing me to appropriately edit the size of each square?

Hey there

I recommend using exact mesurements for level design, it’s easier to work with that.
In your case 3 feet = 90cm which is almost 1m/100cm, the default size of UE’s cube with scale 1,1,1.
How ever, if you want 90cm, the scale would be 0.9 for X and Y.
Unreal Engine’s units are equal to 1cm.