From functional perspective Search hasn't changed, all you have to do is a Start search; then a text box pops in the top left corner. You can start search from the menu or via a shortcut (e.g. Ctrl+F).
Similarly with Reference numbers, when toggled on, they will display at top right of current paragraph, and there's a Go to panel into which you can type reference numbers - Ctrl+G will pop it
Maybe there could be toolbar buttons for Start Search and Go To.
BR