You could zoom into the desired area. Right click on the view and select Show Zoom Controls. If you don't want to see a specific part of the line you could write a calculated field that will make those parts of the line null.
Hope this helps!
Unfortunately, because I don't have all the data points, Tableau ignores the values that are filtered out.
This is an example of what I'd like to happen when I drill down down (i.e filter from one viz to another).
This is what happens currently:
So, because I only technically have one point on the drill down, it is not drawing a line between the points outside of the second viz, which I would like it to do.
Ah, I think I understand, you're using a filter action? Essentially, you're only selecting one data point then, thus only one is appearing on the second sheet. I can't think of a way around this. Are you able to post a packaged workbook (twbx file)?