How do I open a child node by default

[GHzhuzhu]

When I open a project, I want its list of child nodes to be automatically expanded.
How do I set this?

That's the default expansion

[jakezatecky]

You can set the expanded property to be an array of all of the parent node keys. There is currently no option to expand every available node, but that is a feature that is tracked in another issue slated for a later release.

[munishchoudhary204]

Any updates ??

[jakezatecky]

You can set an initial value for expanded to have the as many levels expanded as you want by utilizing expandNodesToLevel. E.g.:

import React, { useState } from 'react';
import CheckboxTree, { expandNodesToLevel } from 'react-checkbox-tree';

// Assuming `nodes` is accessible somewhere, this will open all parent nodes by default
const defaultExpanded = expandNodesToLevel(nodes, Infinity);

function Widget() {
    const [expanded, setExpanded] = useState(defaultExpanded);

    return <CheckboxTree nodes={nodes} expanded={expanded} />;
}