Hi @RubberDuckers,
Thanks for pointing this out. Regretfully, that setting isn’t something we can keep responsive as it gets tricky with dependent properties like that. For the next release (Pro 5.0.8) I’ve adjusted it to not allow being changed at different breakpoints. Once you choose Ratio/Unit, you can responsively change the setting below, but the top level decision will remain.
That being said, it’s still possible to reproduce a 16:9 aspect ratio while using the “unit” option. Set the Height to 56.25%
(9 / 16 * 100), and you can keep the aspect ratio while preserving the flexibility of setting an explicit dimension on other breakpoints.