If there is no tab in the onboarding wizard for bank details when you are onboarding an applicant from recruitment so that they become an employee, you need to set the global setting titled Bank Account Required to true.
To set this, please follow the below steps:
Click Configuration then click Settings.
Expand System Settings then click Global.
Within the Name field, search for Bank Account Required and click on it.
Within the Boolean drop-down, ensure this is set to True.
Click Save.