On very thin layers you may find that the comments overlap each other.
You can easily move these or even hide them by holding the Ctrl key down and clicking on the comment with the left mouse key. Each time you click will move the comment to a new position. Hold Alt key down and click on the comment to hide. This works for either types of comments. You can also position or hide these individually on the table entry screens (Press F4 key for layers, F6 for shears dialogs)
You can hold the Alt key and click on the water content icon in the layer row and this will redisplay the comment for that layer.