how to make 2 row 2 column using flat list in percentage code example

Example: flatlist last item column 2

for your case use flex: 0.5 on the item container

therefore: Your item should have flex of 1/(number of columns) if you have 3 columns your item should have flex:1/3

///on flatlist
columnWrapperStyle={{
     flex: 1,
     justifyContent: 'space-evenly',
}