Few different methods for outpainting on SDXL:

• Simple expansion (no additional prompting/action)
• Full Background Replacement
• Sketch to Render

INSTALL

• Mile High Styler - https://civitai.com/models/119246/comfyuimilehighstyler
• Rgthree - GitHub - rgthree/rgthree-comfy
• IP Adapter Plus - GitHub - cubiq/ComfyUI_IPAdapter_plus
• Impact Pack - GitHub - ltdrdata/ComfyUI-Impact-Pack
• Use Everywhere - GitHub - chrisgoringe/cg-use-everywhere
• ComfyRoll Studio - GitHub - Suzie1/ComfyUI_Comfyroll_CustomNodes: Custom nodes for SDXL and SD1.5 including Multi-ControlNet, LoRA, Aspect Ratio, Process Switches, and many more nodes.
• Efficiency Nodes - GitHub - jags111/efficiency-nodes-comfyui: A collection of ComfyUI custom nodes.- Awesome smart way to work with nodes!
• WAS Node Suite - GitHub - WASasquatch/was-node-suite-comfyui: An extensive node suite for ComfyUI with over 190 new nodes
• Canvas - GitHub - Lerc/canvas_tab: ComfyUI canvas editor page

MODELS NEEDED

• LCM LORA - https://civitai.com/models/195519?modelVersionId=219782
• Yolov8m-seg.pt - https://docs.ultralytics.com/tasks/segment/
• Clip Vision - https://civitai.com/models/133362/imageblender-includes-clip-vision-model
• IP Adapter - GitHub - cubiq/ComfyUI_IPAdapter_plus

YouTube Tutorial -  https://youtu.be/fFdYdTzq7Kg