Hi!
First, Affinity is wonderful, I'm amazed how it changed my workflow so far. But there is some minor stuff that I find really unintuitive.
First, and most used is drag'n'drop of items in layers panel. I find it pretty hard to use, especially when there is option to drop under certain element or as a child. Because insert line is blue and "ghost" of moved item is also bluish the latter kinda covers insert line making hard to say whether I'm dropping it at the same level or as a child of item above. Disclaimer: I have pretty good eyesight ;). The second thing about layers is that I find extremely annoying that I can't drop items on another items - I have to aim beneath the targeted group. That's far from being handy.
And this is more like a question. Is there any way to select items with selection box by starting dragging on top of another items without moving them (i.e. shift+drag)? The only solution I have found so far i to turn outline view on.