The new feature will expand visual media embedded in tweets to fill the whole width of a mobile phone's screen.
Currently, images are indented next to a user's profile photo and take up much less screen space.
Twitter said the new layout - being tested on iOS but not Android - would give media "more room to shine".
The experimental changes to fuel content creation and consumption come amid a rollout of Twitter's subscription service for dedicated users, Twitter Blue.
Source:
BBC