
Hi @SP2019 ,
We could create new headings in Site Settings for the site as shown below:
If you want to further customize the quick launch navigation, it is recommended to use the SPFx extension, please refer to following examples:
https://github.com/tom-daly/spfx-side-navigation
http://thomasdaly.net/2020/06/09/spfx-side-navigation-project-for-modern-sites/
https://ravichandran.blog/2019/04/14/mega-menu-using-sharepoint-framework-spfx-extensions/
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