Why half of niagara mesh facing the outside and half towards the inside

Development Asset Creation FX
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1

This is my parameter setting

341072-qq截图20210609152942.png
341072-qq截图20210609152942.png502×584 284 KB

341073-qq截图20210609152834.png
341073-qq截图20210609152834.png948×508 73.5 KB

341074-qq截图20210609152848.png
341074-qq截图20210609152848.png933×463 58.7 KB

341075-qq截图20210609152857.png
341075-qq截图20210609152857.png960×545 72.2 KB

341076-qq截图20210609152931.png
341076-qq截图20210609152931.png953×637 103 KB

2

I want these mesh all face outside on the X axis, so how can I do?