can't see the forest for the trees

US /kænt si ðə ˈfɔrɪst fɔr ðə triːz/
UK /kænt si ðə ˈfɔrɪst fɔr ðə triːz/
"can't see the forest for the trees" picture
1.

木を見て森を見ず, 全体像が見えない

to be unable to understand a situation clearly because you are too involved in too many small details or problems

:
He's so focused on minor issues that he can't see the forest for the trees.
彼は些細な問題に集中しすぎて、木を見て森を見ずの状態だ。
Sometimes you need to step back and look at the bigger picture, otherwise you'll can't see the forest for the trees.
時には一歩引いて全体像を見る必要がある、さもないと木を見て森を見ずになるだろう。