I’m torturing myself with the Classic Chart component.
I have a dataset with one value per week (starting on monday). Here is the Chart and the Dataset used to populate this chart.
Try changing your chart to a ‘Category’ configuration. This is a slightly painful process that will probably throw a series of errors at you while you’re in the process of doing it.
Change the ‘Chart Type’ property on the chart itself to ‘Category Chart’.
In the Chart Customizer → X Axes, create a new Category axis.
In the Chart Customizer → Dataset Properties, switch the X-Axis of the ‘Data’ property to your new category axis.
In the same Dataset Properties, switch the renderer to ‘Category Bar Renderer’.