MD Composer extras

Theme component
60

A staff class is applied to the <body> element.

So, you can target any buttons like:

body:not(.staff) .d-editor-button-bar {
    /* Hides everything 
     * (visible buttons, including the popup menu button) 
     */
    button, 
    .toolbar-popup-menu-options {
        display: none; 
    }
}

body:not(.staff) .d-editor-button-bar {
    /* Hide specific buttons */
    button {    
        /* Inline buttons */
        &.align_justify_button, 
        &.align_right_button 
        /* ... */
        {
            display: none;
        }
        
        /* Popup menu */
        &.toolbar-popup-menu-options {
            [data-name="Float left"],
            /* ... */ {
                display: none;
            }
        }
    }
}

Would that help?

On a side-note, you might be interested in this component: