Yep this is a doable but is done via the presentation layer in vRO.
You shound never use the XaaS form editor in vRA as it is rubbish and everytime you need to refresh the form you need to make all your changes again. if all the smarts are in the presentation layer most will surface up into vRA, This is how you can hide tabs or populate drop downs with actions using OGNL. And it is much much faster to load the forms. I have done a couple videos on my vblog in regards to xaas and vra https://www.youtube.com/channel/UCWfyTiUBwRKjB_qckVPVpcQ
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Thanks a lot for that solution !
In fact, this is sad not to have the same tuning directly in vRA as the presentation layer in able to handle it.
May-you know if hidding a tab also disables the computing of all the fields that it hosts ?
Yes, with XaaS it will only run the compute when navigating to the Tab, you can still reference fields on the hiden tab etc, but an action for example will only execute when navigated to. This is good for complex forms as it speeds up the loading time. If you were run the same workflow directly in vRO it does attempt to process every field at load time.
Custom forms it is all inbuilt to vRA to hide tabs.