You don't have this feature if you're a member of a Dashlane Business or Business Plus plan with SSO. If you have a passwordless Dashlane account, you can lock individual Secure Notes on mobile devices only so that you need biometrics to open them.
Log in to your Dashlane account with SSO
Passwordless login for Dashlane

You can require a Master Password to open your logins, Secure Notes, and secrets. This article explains how to turn on this setting for individual logins, Secure Notes, and secrets—or all of your logins at once.

After you turn on this setting for a login, Secure Note, or secret, you're asked to enter your Master Password when you copy, view, or autofill the item. You won't have to enter a Master Password or use biometric unlock more than once every five minutes or right after you log in, even when this setting is turned on.

Tip: Turn on Biometric unlock in your web app settings to use Touch ID, Windows Hello, or a security key instead of your Master Password when autofilling protected logins in Google Chrome or another Chromium browser.
Turn on biometric unlock

You can update this setting in the Dashlane web app for logins, Secure Notes, and secrets. For Secure Notes, you can also update this setting in your mobile app.

Note: You'll always need to enter your Master Password when copying, autofilling, or viewing the details of payment methods like credit cards. After entering your Master Password to use a payment method, we won't ask again for another five minutes. You can use Biometric unlock instead of your Master Password when autofilling payment methods in Google Chrome or another Chromium browser.
Autofill payment methods

Require Master Password or biometric unlock for individual logins

1. To log in to Dashlane, select the D icon in your browser’s toolbar and enter your Master Password.
2. In the extension pop-up, select Open the web app.
3. Select Logins in the side menu.
4. Select the login you want to lock and require a Master Password to open.
5. In the Preferences section, select Protect item.
6. Enter your Master Password, and select Turn on.
7. Select Save.

Tip: Turn on Biometric unlock in your web app settings to use Touch ID, Windows Hello, or a security key instead of your Master Password when autofilling protected logins in Google Chrome or another Chromium browser.
Turn on biometric unlock

Require Master Password for individual Secure Notes

1. To log in to Dashlane, select the D icon in your browser’s toolbar and enter your Master Password.
2. In the extension pop-up, select Open the web app.
3. Select Secure Notes in the side menu.
4. Select the Secure Note you want to lock and require a Master Password to open.
5. In the Preferences section, select Require Master Password.
6. Enter your Master Password, and select Turn on.
7. Select Save.

Require Master Password for individual secrets

1. To log in to Dashlane, select the D icon in your browser’s toolbar and enter your Master Password.
2. In the extension pop-up, select Open the web app.
3. Select Secrets in the side menu.
4. Select the secret you want to lock and require a Master Password to open.
5. In the Preferences section, select Require Master Password.
6. Enter your Master Password, and select Turn on.
7. Select Save.

Require Master Password for all logins

1. To log in to Dashlane, select the D icon in your browser’s toolbar and enter your Master Password.
2. In the extension pop-up, select Open the web app.
3. In the My account menu in the upper-right corner, select Settings.
4. Select Security settings.
5. Select Require authentication.
6. Enter your Master Password, and select Turn on.

Tip: Turn on Biometric unlock in your web app settings to use Touch ID, Windows Hello, or a security key instead of your Master Password when autofilling protected logins in Google Chrome or another Chromium browser.
Turn on biometric unlock