Using Add properties to assign ref des in sequence on a schematic, DxDesigner set the property name to visible, so the schematic had Ref Designator=R2201 etc. on it. (I don't remember it ever doing this before; normally it just sets the ref des.)
To reset the Ref Des to normal mode, I selected all symbols using the filter to only select Symbols and then CTRL-A. I then clicked the property name visible tick box twice (I'm not sure how to directly make it invisible, but twice makes it visible and then invisible.). Then I clicked to make the property visible (it seems that making the property name invisible seems to also make the property invisible).
I then found that I had a reference designator on every symbol on the page - including power taps, sheet connectors, border graphics etc. Note that this doesn't only affect ref des. It also does the same for value and other properties. (which crashes our PDM system when diodes and test points come through with properties that they shouldn't ever have)
I assume that this isn't expected behaviour? Was it operator error?