My object become transparent in animation mode

Hi

I have made a banana in blender and it look solid in solid mode preview but when I switch to material view it looks messy and transparent/see through,
I’ve downloaded a free pineapple 3d .obj too and that one is also see through in material view, I’ve made other 3d objects like apple and pear but those look solid in material view.

what is the solution?

can u provide your blend file so we can check it out?

Opps I may have selected alpha blend accidentaly in blend mode so when I changed it to opaque it fixed the issue thanks.