Modern ui current navigation default expandable

Question

Is possible to expand Modern UI current navigation by default despite of clicking arrows icons to expand it and collapsed it.

Answer 1

Currently this is not possible in SharePoint Online Modern experience by using OOTB functionalities.

You can read more about it on SharePoint Tech Community:
Can you set the Quick Launch Menu as to default as collapsed with Modern Pages?.

Also, I found one UserVoice suggestion on SharePoint UserVoice, you can vote on it:
Left menu/submenu expand and/or collapse default behavior setting.