You can hide the Show Password button on the Email page of the Options dialog by setting oApp.lDisplayShowPassword to false in a script, such as Application.AfterSetup or Application.AfterLogin. This prevents the user from being able to see the password for common email settings, such as a SendGrid account.

For example, here is the code for Application.AfterSetup:

lparameters toApplication as SQApplication
oApp.lDisplayShowPassword = .F.
return