Hi ifermagu,
Please go to the ‘Appearance > Customizer > Additional CSS’ and paste below custom css code:
@media (min-width: 1600px) {
.post-template-default .site-content .container,
.page-template-default:not(.woocommerce) .site-content .container {
max-width: 1540px;
}
}
@media (min-width: 1800px) {
.post-template-default .site-content .container,
.page-template-default:not(.woocommerce) .site-content .container {
max-width: 1740px;
}
}
Thanks