Meta Box

Yes, it can work with Oxygen, tested it again on my demo site. In Meta Box, cloneable is a field setting, not a separate field.
Read more in the documentation https://oxygenbuilder.com/documentation/templating/meta-box/

Or use the code to check if the function exists and implement the code, for example:

if ( function_exists( 'mb_register_model' ) ) {
// add your code here
}

Hello,

You can set the flatten setting by using the custom settings of the field. Please check this screenshot https://imgur.com/kiiEgca
It is noted in the documentation https://docs.metabox.io/extensions/meta-box-builder/#custom-settings

Hello,

Yes, other mb- post types are created by Meta Box. We save field groups, settings page, relationships ... as posts of a post type. What is the issue in this case?

Hello,

For the option group, it isn't possible. But you can try to set the sub-choices like this

function my_custom_callback() {
    return [
        [
            'value' => 'monkeys',
            'label' => 'Monkeys',
        ],
        [
            'value' => 'king_kong',
            'label' => 'King Kong',
            'parent' => 'monkeys',
        ],
        [
            'value' => 'curious_george',
            'label' => 'Curious George',
            'parent' => 'monkeys',
        ],
        [
            'value' => 'donkeys',
            'label' => 'Donkeys',
        ],
        [
            'value' => 'eeyore',
            'label' => 'Eeyore',
            'parent' => 'donkeys',
        ],
        [
            'value' => 'guss',
            'label' => 'Gus',
            'parent' => 'donkeys',
        ],
    ];
}

and set the setting flatten to false. Follow the documentation https://docs.metabox.io/fields/select/#settings

Hello,

I don't understand the question clearly. Can you please give me more details? Do you want to manage other CPTs by Meta Box CPT plugin?

Hello,

The function mb_get_block_field() only gets the field value when the block data is saved as attributes (default). If you save the data as post meta, you can use the helper function rwmb_meta(), for example:

WYSIWYG field: {{ mb.rwmb_meta( 'wysiwyg_field_id', '', post_id ) }}

Hello Matthew,

Sorry for the late reply. Let me answer your questions.

1. Yes, "hide from frontend" does not hide the field by JS code like MB Conditional Logic. It excludes the field from loading like MB Include Exclude does. Please read more in the documentation
https://docs.metabox.io/extensions/meta-box-include-exclude/
https://docs.metabox.io/extensions/meta-box-conditional-logic/

2, 3. The custom table created automatically in the builder uses data type TEXT for all columns to be compatible with most fields. Can you please share some screenshots of the field category_name and field group settings? Where do you add the shortcode on your site?