Polygon lines follow cursor when digitizing when adding polygon feature in QGIS

Question

I am drawing polygons in QGIS by moving the cursor and clicking to add polygon corners. So, four clicks, four corners to a polygon. All of a sudden, the polygon lines get drawn as I move the cursor, not when I click to create a corner. I must have accidentally changed something without knowing it.

How do I get back to drawing polygons by clicking on the corners?

Answer 1

You probably clicked R key and with this activated Streaming Digitizing mode, introduced in QGIS 3.20.

Click again R key to deactivate.