Date formatting on x axis

Your data is still being plotted on the specific dates, Power BI is just labelling the axis at a month level. If you hover over the line you'll see a tooltip that gives you the specific date. Tishchenko's suggestion of changing the axis type is the right option if you do want to show each label, but it does mean that each point will be plotted with the same interval (so if your dates aren't evenly spaced it might be a bit misleading).

If this post helped (or Tishchenko's!) then please mark it as a solution so we know the thread's resolved! Thanks!