Space between Value and Lable in Card (New) Visual is missing from December 2023 Release

Hi Nelson-Wong ,
We tested  under the version(2.123.742.0 64-bit (November 2023)& 2.124.1052.0 64-bit (December 2023))&( 2.124.1554.0 64-bit (December 2023)), This feature is not available in the December release, but it is available in the November release.
You can submit this feedback through the Power BI Ideas forum, where you can post your suggestion and others can vote on it. Microsoft regularly reviews these suggestions.

Link to Power BI Ideas: Power BI Ideas
The new card visual is currently being developed and is being updated over several releases. You can try going back to the November version if you want to use this feature.
You can refer to the following link to download the historical version：
Previous monthly updates to Power BI Desktop and the Power BI service - Power BI | Microsoft Learn

Best regards

Albert He

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