Use "Normal" for a balance of speed and size, or "Ultra" for maximum compression (which takes longer).
If you can tell me what is inside the space.7z file (e.g., images, games, documents) or what you are trying to do with it, I can provide more specific instructions. How to recover corrupted 7z archive space.7z
You need 7-Zip (Windows) or a compatible archiver like Keka (macOS). Use "Normal" for a balance of speed and
A space.7z file is a compressed archive format designed to save storage space by using high-ratio compression methods like . 7z files: How to Properly Open/Extract space.7z space.7z