DBT materialisation

I have specified the materialisation as incremental in dbt_project.yml. On execution, it is creating a view in BQ instead of a table. It looks like the materialisation is not getting picked and dbt is creating view by default.

If I specify the materialisation in my model, it works. But I need it to work via the .yml file as well.

What is the structure of the “dbt_project.yml” node?