Arrows are the new way to interact with your bodies from the 3.9 version (coming out in March 2019). Push/Pull, Offset and 2D transform commands will be guided by an arrow. Drag, like before, just make sure to use the handles.
To help you get adjusted to the changes, here are several examples of how the arrows work:
You can move points horizontally or vertically by using the arrows, or in any direction by using the circle in the middle of the handles.
Moving unconstrained lines
The same way as with points: You can move them horizontally or vertically using the arrows, or in any direction by using the circle in the middle of the handles.
Tap on the surface, an arrow will appear. Drag it to adjust the rate of extrusion.
Add fillets or chamfers by tapping on edges/faces and dragging the arrow up/down.