Lightning components such as Ascendix Search requires you to define a custom Salesforce domain name for your organization (known as My Domain).
Without a domain, Ascendix Search will not appear.
Step 1. Click on the gear icon and select Setup.
Step 2. Enter My Domain in the Quick Find bar and select the highlighted result.
Skip this step if “Your domain name is” populated
Step 3. If you do not have a domain select Edit to create a domain for your organization and select Don’t redirect (recommended) for Redirect Policy. Save when done.