It is not expected that updates will be made to the Accordian Widget. Instead, the new expand/ collapse feature on flex layouts in ThingWorx 8.5 and above should help with this. You can either use the responsive container, or set a fixed width, or set a min/max width these containers can take.
In the next release of the product, can will also have the ability to overlay these layouts/ containers on top of each other.
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