Combo Charts are typically used to compare two metrics over a period of time. EDA’s combo chart can only be viewed over a time period in Summary mode, however only supports 1 measure.
In order to compare 2 measures over a period of time using the Combo Chart in EDA, you need to select a dimension, however the chart then summarizes the total for each category (not by period)
There needs to be a “Total” view for summarizing by period to make this visual a viable charting option.
This is fairly standard logic in other BI applications, below is an example which is easily created in Excel and Power BI:
