Changing the aspect ratio in Stable Diffusion

If you’re using the Stable2go Stable Diffusion Web App, the aspect ratio is selectable from a pulldown menu right below the prompt.

If you’re using Stable Diffusion via Telegram, these are the chat parameters for PirateDiffusion

start with /render then add the aspect ratio like this:

/tall
/portrait
/wide
/landscape

Also see:

Size / Resolution