Issues after installing Manjaro KDE

I installed Manjaro KDE 20 on my laptop HP Elitebook 8560W but i am facing two issues.

First: When i installed Manjaro i created two partitions - boot and root. Boot partition is not encrypted and root partition is encrypted, but when i boot it ask me to enter my luks password two times.

Second: I installed the nvidia drivers following this guide: but i have problem with the resolution. After installing the drivers and rebooting the display resolution definitely doesn’t look like 1920x1080, which is my native resolution. It looks like the display is scaling, but in display configuration scaling is set to 100%, and the fonts are also with default values. My video card is built-in NVIDIA Quadro 1000M.