Nowadays, In 3-in-1 Demat accounts, banks impose extremely high brokerage fees for intraday and delivery.
You have a 3-in-1 account, you can seamlessly move money between your trading account and bank account.
Five Best 3-in-1 Demat Accounts in India:

Zerodha 3-in-1 Demat Account (Using IDFC First Bank)
Upstox 3-in-1 Demat Account (Using Indusind Bank)
ICICI Direct 3-in-1 Account
HDFC Securities 3-in-1 Account
Kotak Trinity 3-in-1 Account
https://www.cashhint.com/best-3-in-1-account-india/