Add a custom toolbar
Start11 doesn't allow the creation of toolbars yet. Maybe they will include this at a later date. As a workaround, if you are using the Windows 10 or 11 styles, you could create a new page and pin the files and folders you keep in your taskbar folder to that page. Once you have created the page and pinned your files, you can organize those files and folders into groups and then name the groups.
Start11 ver. 1.25 allows you to use the scroll wheel to scroll through your start menu pages. You might actually find this works better than a toolbar because you have better organization.
This wouldn't work if you're using the Windows 7 or Modern styles.