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Enter developer Mode

sudo docker exec -it fbackend /bin/bash  
bench set-config developer_mode 1
bench clear-cache
bench setup requirements --dev

Verify config is set

cat sites/frontend/site_config.json

...  
"db_type":  "mariadb",
"developer_mode": 1

bench clear-cache

In browser, you can check developer mode by console

Click build icon

If you want to create new app use bench command

bench new-app thos
bench --site frontend install-app thos

Now you can create module and select your new app