The phrase "a narrowing of focus" is correct and usable in written English.
It can be used when discussing a shift in attention or concentration towards a more specific area or topic.
Example: "In recent meetings, there has been a noticeable narrowing of focus on our core objectives, which has improved our productivity."
Alternatives: "a shift in focus" or "a concentration of attention".
This week I felt like there was a narrowing of focus.
After a night or two of insufficient sleep, sleepiness increases, and mood, concentration, memory and attention are poor with a narrowing of focus.
A narrowing of focus might have allowed Thomas to write with more penetration, yet the overall effect of the various chapters is undoubtedly to provide a lively social picture of the British underworld in the postwar years.
But while these stories are as meticulously written as anything by Mr. Ford, they attest to a narrowing of focus by this author since the 1995 publication of his Pulitzer Prize-winning novel "Independence Day".
A string of respected names including Alan Plater and Stephen Poliakoff have claimed that the demise of the single play led to a narrowing of focus and a constriction of ambition by broadcasters in the the 1980s and 1990s as series and serials took over.
Hypnosis involves selective attention, a narrowing of focus and an increased absorption in suggested experiences.
"Hyperprofessionalism" is a disease whose symptoms include self-referentiality, self-absorption, and a narrowing of intellectual focus.
It's less revolution than it is gentrification: a narrowing of the focus to a set of values deemed acceptable to a largely male, middle-class audience".
Here, in individuals with a pathologically weak mental state, psychological stressors were proposed to lead to a narrowing of attentional focus and a resulting disregard of certain sensory input.
[PE TN 2011] Numerous KPs described a perceived narrowing of focus after the transition, with emphasis only on ICTC and condom distribution and reduced support for other sexual health and STI services, including a shift away from treating sexual partners.
Through a constant broadening and narrowing of focus on the total spectrum of available sounds, Oliveros proposed, deep listeners whether composers or performers would be able to comprehend their place within a sonically complete, complex, and unique performance environment.
