Hey everyone!

I am new to Odoo and have a lot of questions, especially about dashboards.

I want to create a dashboard in modul Dashboards. I configure my chart in modul CRM and try to add it to dashboards, but the status is not saved. For example, I have customers on the x axis and revenue on the y axis. I want to sort the customers by revenue in descending order, so from the customer with the highest revenue to the customer with the lowest. But the setting is not saved in Dashboard. Can anyone help me? 

Second question: In various videos I have seen people customising dashboards using python, jss, css and so on. I have noticed that the Dashboard module is limited in its functionality. Does the customisation offer more? Where can I find the documentation?