Sony uses a version of Android as similar as possible to Google Stock, not even the Google Pixels in the Android 14 Beta yet have this possibility of the Double App, a feature that will arrive (but to obtain it in Xperia 1 IV it will be necessary for Sony to update it to the of Android that will get the Double Apps from Google). You can use an App like Parallel Space. I confirm that other manufacturers offer it in their Android customizations.
