Add a toolbox with the list of all objects used in a map

Hello,

I’ve just realized there is a big gap in MAP web editor. There is no toolbox which contains the list of all objects (resources/containers) used on a map you are currently editing.
With maps with a lot of objects it is almost impossible to conveniently and efficiently work on them.
In the Legacy Map Desktop client resources and containers used on a map where nicely displayed in a toolbox on the left and you have an easy and quick access to them. By selecting a resource from the list a corresponding object on a map was selected. Now there is nothing like that in the new web editor.
This is a huge disadvantage.
Please, implement such toolbox. 
Thank you.