crazy little symbols in template design

crazy little symbols in template design

I am trying to edit my inventory template. The header section has squares at the boundaries like a section or object might. I can use these to resize that area.
Inside that area, there are little circles with X's and arrows . What are these?????? And what do I do with them?? I have tried clicking on all parts of them. Can't seem to make sense of them. What do they do - besides annoy me :) ?
I searched help and see no mention of anything other than field codes.