I would like to have a dimension tool in Publisher, Designer and Photo, too. And I would like to propose a tool similar to the dimension tool of CorelDraw, which in my opinion is the best dimension tool I've seen in graphic programs so far. It shows the line length permamently, has automatic snap functions to all kind of nodes, is fully editable (font, font size, font colour, line colour and much more...), and is easy to use.
For my floor plans like appartements, exhibiton areas and so on I still need (or have to use) CorelDraw v2017. Would be great, if I could use only Affinity apps for that.
Ludger