Choose the final format
Start with the placement you need, such as a square post or a wide banner. Decide which parts of the source must remain visible and where additional space would help the composition.
More space around the subject for a wider composition, a new format or considered typography.
AI processing for this workflow is not included in the current workspace.

Ask the extended area to support the composition. Quiet background space is often more useful for a headline than an additional prominent object.
Start with the placement you need, such as a square post or a wide banner. Decide which parts of the source must remain visible and where additional space would help the composition.
Use the final canvas bounds to decide where the scene needs more room. Compare formats against the original frame. A short description can define the intended extension when you have a specific setting in mind.
Review how the extended area meets the original image. Check the horizon, lighting, repeating textures and objects that meet the frame, then assess whether the additional space improves the composition.