V6 When measuring dimensions, any type Linear etc, the dimension shows until I try to set it in position, i.e. when I right click to position the dimension it disappears. Do I have an incorrect setting selected

Does your viewport mode have “Annotations” set to visible?

Normally it’s a left click to set the dimension. Right click will cancel the command.

Where do I find Annotations in the viewport. Dimensions Annotation Styles?

Left or right click has same effect

Display panel - for the active viewport’s display mode.

Ok, thanks, that’s it fixed

No one means ‘cancel’ one means ‘commit,’ depending on if you are left or right handed…