How to clear a layer? delete not working half the time

Question

I don't understand. If I make a new project and work on it then want to clear a layer, I simply hit delete once and it's done. But all my existing projects I hit delete on, either only works for certain layers and things or it doesn't do anything at all.

Like text wasn't clearing from the layer. I had to hand select and delete it.

What is going on and how do I get it to clear the layer entirely on button press?

Answer 1

Apparently just select the layer and hit delete do not work on vector layers. The less annoying thing to do is to use select shapes tool to draw a selection area over everything and hit delete.