Create Symbol toolbar button for quick access
It would be a great time saver to click on a layer and than on a "Create Symbol" button, instead of having to right-click or to switch to the "Symbol-mode"
Currently, you can create a symbol by right-clicking in the Layers panel, right-clicking the object on canvas, or pressing Cmd-K.
It sounds like this suggestion asking for a _toolbar_ button, similar to the one-click Repeat Grid button that XD has already. I will change the title to reflect that (original title was: "Create symbol from layers panel")