1) Could you, please, help me with visualization via combo chart? Is it possible to change line style in combo chart? In particular I need dotted line and of another width. How can I do this?
2) One more question refers to diagrammes as a whole. How can I change data label format (color and size) in diagramme?
You can change the colour and size by going to Text Colour option and put the values of RGB of your choice for the color. This will change the Font colour
For Font size you can go the Axes tab and change the font from there
