Found a fix that now you can have all your apps in split screen!
use the magisk module "QuickSwitch", power off, boot back into rooted system (with fastboot command), download and install the launcher "pixel launcher", dont switch to it yet, open the QuckSwitch App, set the provider to Pixel Launher. do the reboot procedure again... now set your launcher to Pixel launcher and youre all set!
enjoy your desktop-like experience!