I'm on an Arch Linux machine running KDE Plasma desktop environment. I have 16GB of physical RAM installed in my machine. I had 8GB swap memory and apparently have access to 8GB of RAM. I wanted to reduce swap and increase access to more RAM. I used KDE Partition Manager to reduce my swap memory size to 2GB from 8GB.
But now I have some 14GB of unallocated space and still only have access to 8GB of RAM. How do I regain access to RAM and allocate the 14GB to the partition containing most of the OS files and folders?
EDIT: To reduce confusion, here's what I see in the "System Load" section of KSysGuard, the system monitor I use: