Endpoint menu missing in settings in security center

Hi Sara2022 

Thank you for posting your question. If this is a brand new license that you just added and had not been leveraging Microsoft Defender for Endpoint previously in this tenant, then it must prepare your MDE features before "Endpoints" will appear under the settings menu. 

To do so, from the main screen at security.microsoft.com, on the menu on the left, you should see an Endpoints drop-down. Select any item under it and you should see a screen that says preparing your environment. You can also do initiate this by selecting something like Incidents or Hunting.

https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/production-deployment?view=o365-worldwide#tenant-configuration