How to enable and disable Spell Checker in Trident (macOS)?

Note: This article explores enabling and disabling Spell Checker in Trident desktop app (macOS). Click here for the Zoho Mail web app's help documentation.

By default, the Spell Checker will be enabled. To disable it:

In the Mail Composer, click the More Options icon in the rich text editor ribbon.
Uncheck the Spell Checker option.
To enable it, check the Spell Checker option.

Note: This setting applies to all emails you write. If you turn it off once, it will stay off for every new email until you turn it back on.