From the Apple iOS and Android apps:
How to find your version
From your browser:
In Chrome and Edge, select the Dashlane D icon in your browser’s toolbar and select More. The version displays under Extension Info.
In Firefox and Safari, right-click the Dashlane D icon in your browser’s toolbar and select Manage extension.
From the Apple iOS and Android apps:
Go to Settings from the main application menu. Scroll to the bottom to find the version of your Dashlane app.
From the Apple iOS and Android apps: