<?php
function mytheme_block_type_metadata_settings($settings, $metadata)
{
    if ($settings['name'] == 'core/paragraph') {
        $settings['supports']['color']['background'] = false;
        $settings['supports']['color']['gradients'] = false;
        $settings['supports']['color']['text'] = false;
    }

    return $settings;
}


add_filter('block_type_metadata_settings', 'mytheme_block_type_metadata_settings', 10, 2);