To Recreate Several Dimensions' Associativity Using a Fence

Using the Place Fence tool, draw a fence around the dimensions that have lost their associativity.
Select the Reassociate Dimension tool.
In the tool settings window, turn on Use Fence and select a Fence mode.
Enter a data point to select the fence contents.
The dimensions highlight.
Enter another data point to accept the fence contents.
The dimensions are reassociated with their intended elements, and the thick, dashed lines representing broken dimensions are restored to the active line weight.