First know that your bitcoin is not stored on the wallet you used, it's being stored on the blockchain, you only makenuse of the wallet to generate and have access to the required keys needed to decode your encoder bitcoin on the blockchain, so you should make use of a 2FA password for your device security, backup your seeds privately, avoid leaving any private keys informations on your device.

And also don't allow people to have access to your device as well, they can't access your device when the device is secured with password, but when they have access to your private keys, they can move out your bitcoin without using your device, not your keys not your coins.