Backpack the sprite. If your game already has an FPS counter or delta time, remove the section that sets those. After adding it to your project, you can add broadcast blocks to trigger spawning particles. At the moment, there is no way to destroy particles. This will be added in the 1.0.0 update.
A great system for making all kinds of particles in Scratch! I developed this system for creating particles in Scratch games. CHANGELOG: 26 May, 2023 - 0.1.0: Initial alpha release