Sync Bar chart and Line chart based on Date

Hi, I could not find anything on the forum that helped me.

So I want to make this Graph, a normal S-Curve.

I implemented two different sheets, the upper one is aggreggated in Percent on the y axis and a continuis Date for every Day in the x axis.

The bottom one is not aggereggated and displayes the sum per month. (Discrete Date for every Month in the x axis).

I would like to take the Day(Date) axis away and sync both graphs. Tableau for some reason creates a margin on the line graph, adding an extra empty month on the start and at the end.

What could be a solution?

Is there a way to combine them, even tho they have a discrete and a continuous Date for x axis?

Thanks a lot