CSS code needed in order to hide navigation and make content part full width:
.woocommerce-MyAccount-navigation {
display:none;
}
.woocommerce-account .woocommerce-MyAccount-content {
width: 100%;
}
.woocommerce-MyAccount-navigation {
display:none;
}
.woocommerce-account .woocommerce-MyAccount-content {
width: 100%;
}