expression, adverb
within eyeshot; within sight; in view
Used as an adverbial phrase meaning that something is located where one can see it, often implying supervision or monitoring.
子供を目の届くところに置いてください。
Please keep the child within sight.
貴重品は常に目の届くところに置きなさい。
Always keep valuables where you can see them.
Similar meaning but used as a noun phrase ('within visible range'), while 目の届くところに is adverbial.
A set phrase composed of 目 (eye), 届く (to reach), ところ (place), and the particle に, literally 'to the place where the eye reaches'.