Mark Anderson’s suggestion is good.
If troubles still persist. make a new note beside the container. Call it “Polaris”; it’s your guide star.
Now, drag it into middle of the container. You’ll see it inside the container. So far, so good?
Next, go into the container. Hold down cmd-option-control to zoom out, locating your other notes. Scroll to them, select them, and drag them back where you want them.