not see the wood for the trees
can't see the wood for the trees
Cannot see, understand, or focus on a situation in its entirety due to being preoccupied with minor details. The way he's obsessing over one doorknob when we're renovating the entire house makes me think that he can't see the wood for the trees.
not see the wood for the treesBRITISH or
not see the forest for the treesAMERICAN
If someone can't see the wood for the trees, they are so involved in the details of something that they do not understand or pay attention to the most important parts of it. He often helped those who could not see the wood for the trees reach the correct decision. A picture is emerging of an agency that can't see the forest for the trees.