Existing user security applies when switching with user barcodes. If for example, your user accounts are password protected, users will still be prompted to enter these passwords when switching profiles using barcodes.
You can also choose to allow user switching with barcodes without requiring a password. To do this, follow the steps below:
1. Navigate to Setup -> General in the sidebar.
2. From the User switching security drop down select Don't require a password to switch users when switching with a barcode.
3. Once you've done this, click Save.
Quick user switching will always require a password when switching to an account with higher privileges. If a user has not logged in for the day they will have to enter their password once to allow switching without a password thereafter.
For more information on how to manage your User profiles, check out our help articles here