How can I see a Market Depth window in TWS?

TWS offers the following Market Depth windows:

In order to see quotes in the Market Depth windows it is required to subscribe to a Level 2 (L2) market data package from Client Portal. See: Do you provide depth of book (Level 2) market data?

How many market depth levels do you provide?

What is the difference between Level 1 and Level 2 market data?

Do you provide depth of book (Level 2) market data on the CSE market?

Can I change the sorting of the columns in the Market Depth Trader?