$crud->unset_bootstrap();with the above one line of code you are actually removing the calls for:
$crud->unset_jquery();you can remove the call of the jquery from grocery CRUD.
Bootstrap V4 is still in beta version so you need to be aware that some CSS class names may change at the future.
Reasons to buy the version 4:
Bootstrap V3 is simply the latest stable release of twitter bootstrap that we all know.
Reasons to buy the version 3: