There is a method, as Wojciech Paterski briefly mentioned:
You need to 'un-tick' (Display with Solid Leader) box in the Document Properties Tab for Diameter, Radius and Hole Callout dimensions.
If you're too lazy to do this manually, I've created a macro that will do it for you much quicker.
Also bonus, if you have already dimension all drawing with the Solid Leaders, my macro will change each individual dimension to Open Leader.
Please, let me know if it works fine for you and give me a correct answer.
Macro available for downloading here.
Open Leader.swp.zip 12.4 KB