Blender export to studio glitch

I tried to export a tiny mountain I made in blender, and I could see through the wall of whatever side I faced. Does anyone know how to fix this?

https://i.gyazo.com/653910d0c0d96890d7524804b038a867.mp4

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Your normals are facing the wrong way, select all faces in edit mode go to mesh> normals > recalculate outside

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Hey just to know: Do we need to do that step for each faces, one at a time or is there a way to recalculate every faces without doing it one at a time?

you can select them all at once and recalculate them all at once c:

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Shortcut to recalculate normals is shift+n while you have everything selected in edit mode.

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Go into edit mode

Ctrl+A

Ctrl+N

Also enable this