Type on path: End point won't reach end of path

By reading posts and watching tutorials, I've (at last) figured out what the symbols and mouse icons and behaviours are. However, I can't move the end point any further along the path. My intention is to move the start point a little down (already done in the image) and then move the end point along so all the text appears (the end poing circle has a + because there's more text to display. No matter how I move the mouse, it won't move past that point on the path.
Photoshop 2024
Windows 10
