I created a new polygon feature in QGIS 3.4 using the add polygon feature tool. I accidentally clicked the right mouse button to finish creating the feature. I want to continue being able to add points using one click. I am able to add new points using the vertex tool, but this is much more cumbersome than when using the add polygon feature tool because I need to click on the '+' and then click where to add the new vertex (two clicks instead of one).
Is there a way to 'go back' to the functionality of the add polygon feature tool, where only one click is needed to add a vertex?