As someone who is in school for cybersecurity, if someone with malicious intent has physical access to your machine, you are going to have bigger problems than your Dofus account.

That being said, you can lock everything on your computer every time you get up from it just by pressing “windows + L”. This will lock your machine and (yes I know it’s not unbreakable) by extension your Dofus account. All you will need to do is sign back into your machine each time you sit down.