After theme update(6.0 to 6.3xx) to the latest version menu, widgets, logo disappeared, blank screen, etc

For all the existing users who updated the theme from the old version 6.xx to 6.3 or later You need to register your theme again via WP Dashboard > Avas. if your won't able to see the below registration page then please clear the browser cache, plugin cache, etc, then check the page again and register your theme to get the automatic updates regularly and unlock all theme's features.