Under Preferences >> Signatures…
While trying to set default signatures for all accounts and aliases, I am unable to assign appropriate signatures for all accounts or aliases because the email/alias list does not scroll to reveal all accounts/aliases.
I have 14 email accounts setup in Mailspring with a Pro Subscription, and after adding all aliases, I have a total of 27 addresses, but only 19 are visible under Accounts in the Signature settings and the rest - the ones added last - are not visible or available for selection. At least I haven’t been able to make it happen.
***This is version 1.91.30ef802f (Linux - KDE Neon)