Changing password on the current Bitwarden app can only be done on the web vault; this brings up several issues: possible phishing attack, and web vault by itself is not as secure as the app. So it will be useful to add these security features such as changing password or rotate encryption key to the app directly (i.e. without being directed to the web vault).
Hi Kiyoshi, there is an existing request here to be able to change your master password on all platforms. I’ve updated your post title to just refer to the Rotation of encryptions keys via the app.