How would you solve this without guessing?

This is proving hard to visualize from just a picture but I think it's the column with the most numbers. There isn't enough room for the empty space between the bottom 1 and 3 to NOT be a block

So that makes the block in the 1 4 row the 4 and then you know the 1 goes in the first column.

I think. Double check before you commit lol