Need help to enable multiple selection for Secondary Y-Axis in Deneb custom visual DirectQuery mode

[KS7]

I’m working on a Deneb custom visual in Power BI where I’ve added multiple parameters on the secondary Y-axis.
Currently, I’m managing them using a dropdown parameter, so the user can select one metric at a time and the chart updates accordingly.

However, my requirement is that the user should be able to select multiple values from the dropdown, and the chart should plot multiple metrics on the secondary Y-axis simultaneously.

Here’s a summary of what I’ve done:

• Using Deneb visual (Vega-Lite JSON specification)

• Data source: DirectQuery

• Secondary Y-axis contains multiple parameters (for example, Efficiency, Temperature, Voltage, etc.)

• Currently controlled by a single-value parameter dropdown

Needs:
i want to select more than one metric at the same time and visualize all selected metrics together on the secondary Y-axis.

Question:
Is it possible to achieve multi-select functionality in Deneb (especially in DirectQuery mode) using parameters or an alternate approach?
If yes, how can I modify my setup (parameter / JSON / DAX logic) to support multi-select plotting on the same axis?

Any suggestions or examples would be really helpful!

Thanks in advance,
Khyati Shah

[v-pnaroju-msft]

Hi KS7,

We are following up to see if what we shared solved your issue. If you need more support, please reach out to the Microsoft Fabric community.

Thank you.

[v-pnaroju-msft]

Hi KS7,

We would like to follow up and see whether the details we shared have resolved your problem. If you need any more assistance, please feel free to connect with the Microsoft Fabric community.

Thank you.

[v-pnaroju-msft]

Hi KS7,

Thank you for contacting the Microsoft Fabric Community Forum.

Based on my understanding, the Deneb custom visual currently does not support multi select parameters that dynamically plot multiple metrics on the secondary Y-axis when using DirectQuery mode. This is by design. Deneb parameters based on Vega-Lite accept only a single value at a time. Consequently, only one metric can be plotted at any given time via parameter selection.

We hope this information clarifies the issue. If you have any further queries, please feel free to contact the Microsoft Fabric Community.

Thank you.