Adding new nodes or moving segments with Vertex Tool in QGIS 3.10

Question

I'm used to work with simple polygons and the vertex tool. But now the Vertex Tool doesn't show me the capability of adding new nodes in centerline neither move polygon's segments. The function just disappeared.

Now the vertex tool only gives me the option to move the existent vertices. There's no more the "+" symbol giving me the option to add it. But, otherwise, it still gives me the option to add a new vertex while at the end of a line:

Answer 1

In QGIS 3.10+ you can double click on the line to add a new point. You can move the whole line segment, click on it (not at the middle) move the mouse to move the line and click again to move the segment. In my QGIS version I can see the + at the middle of the segment, clicking on it I can add new point. You had better to update to the latest LTR version.