I agree, it's one of the worst interfaces in many regards. Especially the "new" steam.
To answer your question: you don't have to do anything for automatic updates. You can disable them manually though. For that:
- go to your library
- right click on "IL-2 Sturmovik: Cliffs of Dover"
- select "properties"
- in the pop up window browse to the "updates" tab
- change the settings to your preference
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