This is the 4703rd most frequent Chinese word.
盯
To stare or fix one's gaze on.
In this sentence, '盯' denotes focusing one's gaze attentively on an object, specifically the computer screen, indicating a concentrated activity.
他每天都盯着电脑屏幕工作。
He watches the computer screen every day for work.
Here, '盯' conveys the idea of staring fixedly, indicating the kitten's strong attention towards the birds.
小猫紧紧盯着窗外的鸟。
The kitten is staring at the birds outside the window.
In this usage, '盯' metaphorically refers to paying close and persistent attention to something, here being the details of work.