Once Again: How to Remove Option from Gutenberg Editor for Specific Block in theme.json

Question

Since WP 5.8 we can define various settings in the theme.json which is much appreciated and really helpful. But there are still some options I cannot find, e.g. how can I remove the layout panel from the core/group block?

In theme.json, I tried (not sure about the layout-key):

{
    // ...
    "settings": {
        // ...
        "blocks": {
            "core/group": {
                "layout": false // or [] or {} <-- no effect
            }
        }
    }
}

or

{
    // ...
    "settings": {
        // ...
        "blocks": {
            "core/group": {
                "layout": {
                    "customLayout": false // <-- no effect
                }
            }
        }
    }
}

The following answers here were quite close:

• How to remove specific panels in the editor (Gutenberg) when editing a block (via right panel)?
• How to remove unwanted panels inside InspectorControls from core blocks in Gutenberg
• Remove border radius setting from the Gutenberg button block?

So my question is

Where can I find a complete list of all the possible settings for core-blocks in theme.json?

Alas, the official twentytwentyone theme does not contain a such file.

Answer 1

This is now hypothetically possible in Wordpress 6.4:

To disable the controls for all blocks, "allowEditing": false should be added to settings.layout, like so:

"settings": {
    "layout": {
        "allowEditing": false
    } 
} 

To disable the controls for individual blocks, add "allowEditing": false in settings.blocks.[block name].layout, thus:

"settings": {
    "blocks": {
        "core/cover": {
            "layout": {
                "allowEditing": false
            }
        }
    } 
} 

However, disabling layout makes the row/stack block variations useless since all the alignment controls disappear along with the content/wide size stuff.