Unable to create new group in paint history

Hi, I know this sounds daft but I want to create a new group in the paint history window then rename it, but I have no + icon at the top of the window that I can see in all the other tutorials I have seen.
Is this something I nee to enable?
Have had the same issue on 2020 and 2021 versions.

@mark5 Unfortunately, the Add Group icon was a casualty of upgrading many of the icons to 4K and it appears this one is missing. We will fix this in the next point release, but in the meantime, you can click to the left of the Show Strokes icon where Add Group should be and it will work. Sorry for the inconvenience.