I'm following Blender Guru's donut tutorial, and I'm stuck at the part where you use extrude to create dribbles: https://youtu.be/R1isb0x4zYw?t=630
I added a subsurf modifier before trying to extrude. If I add another subsurf modifier, it doesn't fix the problem. Proportional editing was on before I hit E. My dribbles are still square shaped. When I left-click to finish extruding, in the "Extrude Region and Move" pop-up that appears at the bottom of the screen, the "Proportional Editing" box is unchecked, but it's still toggled on in the toolbar at the top of the screen. If I check the box, the dribble becomes rounded, but the new face collapses. I feel like I must be doing something wrong, because it didn't look like too many people had a problem with this step. What should I be doing to make dribbles that are rounded instead of square?
Edit: The shape of the dribble is still square in object mode.