Hey developers 
we wanted to give you a heads-up about an upcoming change to the minimized/mobile preview window for apps using the Content Publisher Intent.
What’s changing
We’re increasing the preview size to better serve our mobile users — you’ll see a larger, fixed container at a 4:5 aspect ratio:
The default desktop preview remains unchanged, but the minimized preview window is also getting bigger.
What this means for you
If your app renders its preview using CSS scaling or transforms tied to the current fixed dimensions, it’s worth reviewing that code ahead of the rollout.
No API contract changes here - this is a rendering-side fix, so you shouldn’t need to do anything unless your preview relies on the current aspect ratio assumptions.
We’ll follow up here with the exact rollout date once it’s confirmed. In the meantime, if you have questions or want to flag a potential issue, drop a comment below.
Thanks for bearing with us while we get this right 