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**BUMP**
9 years later, still need a solution for this ...Anyone out there in Autodesk land care?
Doing this individually wastes hours of time on large projects
Wow, what a bump! 9 years!
You cannot select multiple mullions to use the toggle, but you can prevent excessive future changes if you predefine the preferred joint condition in advance, in the curtain wall's type properties:
Ok so this is the first time I saw this post and there is actually a solution:
Select your mullion > Right Click > Select Mullions > and there are many different options for example "On Gridline" > Then select the "Make Continuous" in the Ribbon.