Your new monitor makes a photograph look crisp, but the menu labels are tiny. Lowering the resolution may enlarge the view while also softening text. Scaling changes the size of interface elements without requiring that resolution change.
Change one setting on the right monitor
In Windows 11, open Settings → System → Display and select the affected screen. Note its current scale and resolution before adjusting anything. Start with the recommended resolution and scale, then try another offered scale if reading is uncomfortable. The recommended values are a starting point, not a requirement to tolerate text you cannot read comfortably.
Suppose a menu is too small at 100% and 125% is available. Try that scale while leaving the resolution unchanged. Compare a paragraph, a menu and a familiar application. Expect larger controls to leave less content visible at once; the aim is a useful balance, not the largest possible percentage.
Find out whether one app is the exception
Move the same window between monitors and compare it with another app on each screen. If only one program looks blurry, note its version and the display where it happens before changing the whole setup. Save your work before restarting an app or following advice that requires signing out. The linked Office troubleshooting page is older guidance, not a guarantee for every current version.
Finally, keep screen comfort separate from document layout. Enlarging the interface is not the same as increasing a document’s font size. Check the exported file or print preview when the recipient needs larger text on paper.