You can mix chart types by selecting different options underneath each metric card in the "Metrics" section of your Table Options.
For example, plot a few metrics and select "bar." Then, scroll down and click the line icon next to one of the metrics. You will now see the chart reload with that metric as a line, plotted over the other metrics visualized as bars.
There are a number of combinations you can create with mixed chart types. As you may remember, line charts have two options for smooth vs rigid lines. When you toggle one metric as a line in a chart that initially started as a bar, Malartu will default to the line option you had last selected when creating a line chart.
To change this, toggle the visualization type to line, select the desired option, then back to bar.