Twitter is reportedly redesigning its mobile apps to prominently feature a discovery tab for Twitter spaces in the navigation bar at the bottom. The new discovery tab will be in the middle of the navigation bar, sitting between the search magnifying glass and the notification bell icons. It is currently being tested for the iOS app for users who registered for the Twitter Spaces beta programme. Twitter will start a broader rollout after the tests report no bugs. Twitter has also introduced Twitter Blue subscription service for users in Australia and Canada. Twitter Blue will give users a window of 30 seconds to edit and undo tweets before posting them.