So I recently discovered UE5 Niagara fluid simulations, and decided on trying to make a good 3d gas explosion. I was messing around with the settings but there was one problem I couldn’t solve, which was a red box trapping the explosion into an area, and clipping off the edges of my explosion. If someone knows how to scale the box up so that it doesn’t clip my explosion, and / or hide the red box so there isn’t a huge red box in game, I would be eternally grateful. Thanks in advance.
Hi. You can hide the red bounding box by unchecking it.
Here’s a video example by Chris Murphy showing you how to do it. I have timestamp it to lead you directly there
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Oh got it now 
! Thanks for the reply
And do you know how to force it by any other method?
Mine is bugged, I check and uncheck and nothing happens
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I’m using 5.1 and unchecking the Overlay tab in Editor Details doesn’t deactivate it. You have to go inside the Emitter Summary and then the Scalability tab and uncheck Grid Bounds Overlay. Hope this helps!
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In 5.3, it change to Emitter Summary->Simulation->Draw bounds
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In UE5 Niagara fluid simulations, the red box you see is the “Grid Bounds Overlay,” indicating the fluid’s simulation space. To achieve your desired gas explosion effect, you can:
1- Hide the box: Uncheck “Grid Bounds Overlay” in the Emitter Summary’s Scalability tab. This removes the visual box in-game but the simulation still functions within its boundaries.
2- Scale the box: You can’t directly adjust the bounding box size. However, manipulating the Emitter’s “Spawn Parameters” like Initial Speed and Lifetime can expand the fluid’s influence beyond the box, effectively creating a larger explosion within its limitations.
Remember, scaling beyond the box might impact performance. If needed, consider creating multiple smaller emitters strategically placed to achieve a larger, seamless explosion effect.
Thank you this solved the problem.
Update in 5.4.4 or may be even at earlier Versions… uncheck “DrawBounds”
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