I'm unable to save any shapefile edits (polygon, point, line) using QGIS. I have tried multiple versions including 3.4 and 3.8. I have tried removing all installed plugins. I have tried new projects, creating new shapefiles, nothing is fixing the issue. It was working last week without issue but as of this week has not worked.
After you press the pencil button you can edit your shapefile layer. After editing you just press it again and if you made any edits it should ask you to save the changes. You have to select the layer in the layers panel to be able to press the pencil.