The Managed Home Screen app for Android Enterprise dedicated devices does not support showing the status bar while in kiosk mode. This is a limitation of the Managed Home Screen itself, as it is designed to restrict user access to certain device features and provide a controlled environment.
Since you have already enabled the settings for system navigation features and notifications in your device configuration profile, it appears that these settings are not effective in displaying the status bar while using the Managed Home Screen. Unfortunately, there is no built-in way to enable the status bar in this mode.
As a workaround, you might consider using the virtual home button feature, which you mentioned, or explore if there are any third-party applications that could provide similar functionality without compromising the kiosk mode's integrity. However, be cautious with third-party applications as they may not integrate well with the Managed Home Screen or could introduce security risks.
For further assistance, you may want to check with Microsoft Intune support or the community forums for any updates or additional workarounds that may have been discovered by other users.