Thanks for the reply, Nathan.
I am using version 7.5 and I use Chrome.
The steps I follow are the following:
1- Add layer
2- Select source -> Wep Map Service
3- I enter the URL of the WMS
4- Load capabilities
5- I select the layer, the style and add the layer.
The layer I add is queryable (the elements contain information) but I cannot select the element and consult it from Maps. For example, with QGis, I access with the "info button". I also cannot access a legend of the information displayed.
There are no errors in the console and I have no problem displaying the layers. The layers are displayed correctly.
Thank you very much for your help.