post width

Hello,

You can set the max-width from the Customize > Blog > Single Posts. It should work. Can you share your site link so that I can check it?

No, it is not allowed. It is against the forum guidelines.

Hello,

Try to add the below code to the Customize > Custom CSS section and check it works or not.

.entry-content.clr {
    max-width: 700px;
}

Okay, then you need to also adjust the width of the sidebar using the CSS code. Let me know if you need help with it.

Use the below code instead of the previous code. Add it to the Customize > Custom CSS section.

div#primary {
    max-width: 700px;
}
.widget-area.sidebar-primary {
    width: calc(100% - 700px);
}

You’re welcome!