Your master password can only be changed from the web vault.
Changing your master password will log you out of all Bitwarden applications.
- Log in to the web vault at https://vault.bitwarden.com
- Click Settings in the top navigation bar
- Locate the Change Master Password section under My Account
- Type in your current password, the new password you want, and then re-type to confirm
- Click the Change Master Password button
- Log back in to confirm that your new password is working
- Log out and back in any other Bitwarden applications that you are using. You will eventually be logged out automatically.