System Settings -> Users -> deck -> change password
Also change to chosen password when kdewallet is requesting
Also confirm when Chrome is requesting next time you start it
In Konsole
sudo steamos-readonly disable
sudo pacman-key –init
sudo pacman-key –populate archlinux
sudo pacman -S tigervnc –noconfirm
sudo pacman -S xorg-xinit
mkdir .vnc
sudo vncpasswd ~/.vnc/passwd (No to view only password)
sudo chmod 600 ~/.vnc/passwd
sudo steamos-readonly enable
x0vncserver -passwordfile ~/.vnc/passwd
Source: https://www.reddit.com/r/SteamDeck/comments/ul8uvu/install_vnc_server/