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This study analyzes the design characteristics of recommendation entry interfaces across four major mobile SNS short-form video platforms: TikTok, Instagram Reels, YouTube Shorts, and Facebook Reels. Through a comparative case analysis across three dimensions—layout, auto-preview duration, and loop range—the findings reveal that each platform adopts distinct strategies for balancing machine agency and human agency prior to full-screen playback. From a Human-AI collaboration perspective, this study proposes design implications for creating more balanced interaction experiences in short-form video platforms.