wp-calypso/client/dashboard/sites/settings-site-visibility/style.scss

.dashboard-site-settings-privacy-form .components-checkbox-control:has(input[type="checkbox"]:disabled:checked) {
	label {
		cursor: default;
	}

	input[type="checkbox"] {
		background: #f0f0f0;
		border-color: #ddd;
		cursor: default;
		opacity: 1;
	}

	svg {
		fill: var( --dashboard__text-color );
	}
}