This is not yet implemented, see this topic: 

Conditional layout works does not work in form | Thinkwise Community (thinkwisesoftware.com)

Any info where it stands on the backlog?

It is currently not yet scheduled for a release. If you feel this needs a higher priority feel free to create an idea for this to give it a higher priority, if there is enough interest. 

Don't think this is worth an idea. I guess it will be implemented soon enough to be on par with the windows GUI, there it works and is used by the SF.  

Hi Freddy,

As part of the next release (2024.1.13.0), conditional layouts will be applied to the progressbar itself and not on the grid cell in behind anymore.

In addition to this, progressbars in cardlists will also listen to conditional layouts now.

Best regards,
Erik