I found a post with essentially the same issue as I have.
However there is no solution, and those workarounds aren't working for me.
I basically have a scatter plot with time in the x-axis and average price in the y-axis.
The time axis is shown as categorical, and cannot be changed to continuous. If I use different visualizations the axis works fine, but not in the scatter plot visual.
This seems to me more like a bug or feature request, than a how-to. But perhaps someone has an actual fix for this.
you have to change the type of column to Date type. by using modeling tab on the top.
Hope this will help