After applying the clustering method in the legends settings layer "Cities", the map can look like shown in Map 1.
Example 2. The result of the fractal creation on the map is shown in Figure 2. You can read more about the fractal creation on the map in OpenWebGIS here.
Find out how to create clusters and maps like Map 1 and Map 2. For it you must change the layer legend . To do this, click on the word "legend" under the layer name, you are interested in. Afterwards under the layer name the area will appear on which you click to open the legend settings window. Look at the Figure 3.
In order to see the attribute information of the layer you are interested in (for example "Fractal") you need: to select Layer's name "Fractal" in the dropdown list "Editable Layer". Then click (on the map) on the point or line, polygon you are interested in. The values of all attributes of the point, line, polygons you can see by hovering the cursor over it and clicking on it (if while hovering over a feature, it is not activated, then move the map a little bit and then again hover the cursor). After clicking on the feature you are interested in, the pop-up window will be opened. In this window you will see all layer attributes. See the result of it in Figure 7.
The clustering can be applied not only to point features, but also to polygon and line features of vector layers.