Coming in late July 2020 - Windows Outlook Signatures will Sync with a users email account, traditionally Outlook only saved Signatures to the device which Outlook was installed on. Once this update is available, Signature will be Synced and available across all devices a user is signed into.
Signatures will remain within Outlook options as previous, this is just one of the many cool enhancements coming to Outlook making it more adaptive to working across multiple devices. Setting up new devices is also becoming much easier, as your personalized Settings now Sync with your sign-in and Outlook feels the same Anywhere!
Have fun :)