Just select the entire dimension line and drag like you would any other element.
If they are associated to your model elements they will stay associated.
If not you can constrain the drag direction with the SHIFT key or by using your guidelines.
If you have a group of dimensions (multiple lines) and you want to adjust the spacing between the lines then unfortunately you will have to move each line individually.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11