Your graphic system is severely broken, proper drivers are not installed or loaded on both GPUs, Vulkan is rendered through the CPU, no wonder that you have glitchy windows!
Please cancel the “nomodeset” option from the boot command line, then reboot and post the results of:
zypper lr -d
lsmod |grep -E "nvidia|amd|radeon"
zypper se -si nvidia
(you need superuser rights or use sudo)