Flex 1

Can someone explain how does an element with flex 1 and another element with 320px begin to wrap next line?
<Container maxW={"960px"} py={[4, 4, 16]}>
            <Flex justifyContent="center" gap={"12px"} wrap="wrap">
                {/* Left Side starts below */}
                <Box flex={1}>
                    {/* Heading start */}
                    
                 
                </Box>
                {/* Left Side ends above */}
                {/* Right Side starts below */}
                <Grid placeItems={'center'} py={[5,0,0]}  w={320}>
                    <Image borderRadius='lg' src={photo} />
                </Grid>
            </Flex>
        </Container>
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