All existing signatures are displayed as tiles on the Home page.
If you want to ensure that an email signature is not used but kept for future use, you can disable it. To do this, hover your cursor over the required signature tile and use the Disable option:
This displays the Applies to page. This page varies according to the email service that you've configured for Exclaimer Cloud - but essentially, you can enable/disable options for server-side and/or client-side signature processing. For example (options shown for Office 365):
To completely disable a signature, you should 'switch off' the Apply this signature option, at the top of both server-side and client-side tabs. Having done this, you'll see confirmation that the signature won't be applied to any messages:
When a signature is disabled, the signature tile displays a Disabled banner to show it is inactive:
You can still make changes to a disabled signature, but it will not be used until it is enabled.