Screen resolution too large after Manjaro KDE installation 26"

Hello. I installed Manjaro KDE Plasma 21.3.7 version as Dual Boot on my system. However, even in live mode on the flash drive, the screen was huge. The windows, the taskbar, the text, the icons, etc… were huge. After installing it as proprietary, it automatically installed the Nvidia 390 driver. Although the screen resolution is 1920x1080, it does not fit the monitor. My screen is a 26" screen. Windows supports 1920x1080 or higher resolution, but not here.

As you can see in the picture, this is the problem. How can I solve this problem?

check in system settings/display configuration/resolution…
also play with the global scale option in system settings and the force font dpi option