Twitter started rolling out bottom navigation to all Android users, This feature was released in the alpha build a some months ago and now made available for all users.
You don’t need to wait for any special update from playstore before this change can take effect, All you need to do is to update your App and it will automatically take effect. This all You Need To Know About The Bottom Navigation;
The bottom navigation bar is basically moving the top level sections, such as Home, Moments, Notifications and Messages from above the timeline to below. This is a bit in line with Google’s Material Design guidelines, which now dictate that top-level navigation bars should ideally be at the bottom, possibly making them easily accessible on phones with big screens. Though Some parts of the UI are still up top, like the search bar.
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