No, the trial edition of Zoho CRM Enterprise gives you the exact same features as the paid Enterprise edition. The differences aren't about functionality, they're about scale and duration.
During your trial, you get full access to every feature included in Enterprise edition, including advanced automation, Zia AI capabilities, multi-layout customisation, approval processes, and everything else at that tier. There's no feature-limited or watered-down version of the trial.
Your account doesn't disappear or get suspended. If you haven't upgraded to a paid subscription by the end of the 30 days, your account automatically converts to the Free edition, and you keep access to your existing data. The Free edition, however, offers considerably more limited functionality than what you experienced during the Enterprise trial, so features you relied on during the trial period will no longer be available until you actually subscribe to a paid edition.