Hello!! I'm new to cad libre. I can't use anything related to the hatch, I don't have any window after clicking on the icon. The other functions apparently work fine. My PC is a 64bitARM w10. I haven't tested it on a normal 64bit w10 yet.
After clicking on the icon, select the object(s) to be hatched, then close the selection with Enter, and the window appears!
Or select the object(s) first, by single click(s) or by pulling up a frame around them, and then click the icon.
Yes, you must have a (precisely) closed contour to get a hatch. No gap or overcrossing at the corners. You also can't just click into the wanted area, you have to select the shape elements.
Sorry, not as advanced as autodesk.