X6 Dimension tool settings Greyed Out.

When I click on Dimension tool, many of the properties on the Property Bar are un-editable (greyed out)

The first 6 properties, Style, Precision, Units,Prefix, Suffix and Leading Zero are all greyed.

The next few like Dynamic Dimensioning etc. are all fine.

This seems to be the case on new as well as existing documents.

I'm sure this has not always been the case (but my memory ain't what it used to be )

What do I need to do to have editing access to these?

I regularly change from 1 decimal to no decimal and I can still change properties by using Tools/Customisation/Toolbox/Dimension Tool but it was so much easier when I could just click on the Property Bar.

CoreDraw X6.1.0 on Windows10 21H2

Thanks

Chris