Declarative pipeline parallel input blocks all branches

[rouke.b...@infosupport.com]

I have a pipeline that is used to deploy (on user input) the latest build to customers, with a parallel branch per customer. 

The build currently uses the Delivery Pipeline plugin to do this and this works. 

I am trying to make this work in declarative pipeline but the current input step pauses the whole pipeline and I cannot switch to the parallel branches to approve them without first approving the first branch.

Is this by design, and if so could this be changed? Or is this simply a bug in the blue ocean pipeline view that makes me unable to switch to the correct branch?

I may not always want to immediately deploy the product to a certain customer, but at the same time want to deploy it to others. Currently it does not seem possible in declarative pipeline to do this with user input.