Explore all the possibilities of the Measurements panel by paying attention to the menu button on the panel's very left near "Measurements".
Open it and you'll see the following options:
Filter your view to any particular folder / measurements with the help of this option.
This feature allows you to create templates for folders in order to group and structure your measurements in the way you need, as well as reuse the previously created templates in any of your next projects. Read here how to use the feature.
This option helps you to easily invert the selection of your measurements.
Delete empty folders:
This option serves to remove all the empty folders in the Measurements panel.