Transparent mesh

So I’ve made a blender mesh but when I import it it’s 2 parts that are like transparent when you look at them

as you can see it should not be transparent

So you can see that now the part where I looked earlier is there but the bottom is transparent
Please help.

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Go in edit mode press A then Shift+N then hit “recalculate outside”.

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The only button is Inside for me

You need to flip your normals. Try watching this video
https://www.youtube.com/watch?v=SRnf7UZRZaA
(I’ve not watchted this video before. It may contain some colorful language.)

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You just do it without hitting the inside button.

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