Setting up CakePHP CRUD plugin to use tables from another plugin

In the controller where you initialise Crud:

$this->loadComponent('Crud.Crud', [
// ...
]);
$this->Crud->useModel(sprintf(
    '%s.%s',
    'MyPlugin',
    $this->Crud->getController()->defaultTable
));

Prevent linking to the plugin where your tables are:

    /**
     * Before render callback.
     *
     * @param \Cake\Event\Event $event The beforeRender event.
     * @return void
     */
    public function beforeRender(\Cake\Event\EventInterface $event)
    {
        // prevent linking to the table plugin: start
        $viewBuilderVars = $this->viewBuilder()->getVars();
        if (isset($viewBuilderVars['associations'])) {
            foreach ($viewBuilderVars['associations'] as &$association) {
                foreach ($association as &$associationTable) {
                    $associationTable['plugin'] = null;
                }
            }
        }
        $this->set('associations', $viewBuilderVars['associations']);
        // prevent linking to the table plugin: end
        if ($this->viewBuilder()->getClassName() === null) {
            $this->viewBuilder()->setClassName('CrudView\View\CrudView');
        }
    }