Xfce Forgetting Internet Password

Hi. I have KDE-Manjaro installed on my computer, but the graphics have become glitchy – even while reading or writing text, the lines take a bit too long to resolve into letters. This only became an issue about a month ago. I assume I have to fix the screen resolution in settings somehow?

In the meanwhile, I have install XFCE desktop. No more graphics issues, but now I am having password issues. I have to reenter my Wifi password every time. Is this because I don’t have easy access to KWallet? How do I get this or is there some way that XFCE stores network passwords?