One of the things I find particularly cumbersome in Appery builder is dragging components within the page. It is a frequent operation even, if you are a skilled developer since your ideas and user ideas about how the app should look like may vary greatly during the project time. Sometimes it involves moving over many objects which can't be done in a single step because builder's preview screen does not scroll when you drag something. So you have to make stops - drag the component a bit up often inside other component, scroll the screen up or down and then make another move.... Not a pretty UX
Sometimes it is not possible at all and the only way to move component to a new location is to create a custom component from it and then put that custom component in the new place.
My recommendation is to add something that would facilitate that process. Perhaps a tree that shows the complete structure of the page.
Current breadcrumb is fine and should stay that way but having something extra that facilitates moving objects would be a great relief.