I saw the recomended image sizes, and dont resolve the issue.
I used icons in png with 150×150 size, but in home page, in the widget, some icons (not all) are 512×300, and I don’t know why.
In wordpress’s menu editor, you can grab the page and move to right. There is the mode you can build a menu with child and parent pages, the parent pages are aligned on left, and the child pages are below with a little tabulation.
You can create a tree of pages with drag and drop. I hope it was helpful 🙂
