Step 1. Make Sure your personal developer instance is in Tokyo.

Step 2: Navigate to sys_properties.list and set below properties to true

After performing above steps we can experience the new UI

in filter navigation type sys_properties.list

open list after u can enter

*glide.ui.polaris.experience is set to true if you want for new ui ...

*glide.ui.polaris.dark_themes_enabled - true if you want to dark theme purpose use this ...