Hi Alex –
Simple solution: log out of AxCrypt once you’ve finished!
None of the other users will be able to see your files† and if multiple people want to encrypt their files then they can all create a free AxCrypt account.
Normally I’d suggest you have different Windows Accounts for security reasons but with TeamViewer effectively prevents this. You’re making yourself very vulnerable in general by having a single user account for everything but this isn’t something AxCrypt can help you with.
† Unless one of your users installs a keylogger or malware onto your system and then you’re screwed.