If you have a report with more than one metric, you can change the arrangement of the Y-axis.
The default is separate scales for each metric, as below:
Merge or Move Scales
Open the Report builder or the visualisation menu by clicking the cogwheel on the top right corner of the report
Click and drag metrics to rearrange the axis. You can either:
Merge - Drag one metric on top of another to merge the scale.
Move - Drag the Axis onto the header 'New Y-Axis on the Right'
It is worth considering whether the scales are of a similar range. Here it makes sense to combine Revenue and cost, and the move orders to the right axis to display the report more clearly.
Here, we have done both: