How can I skip display of repeat events on the manage events page?
You need to add some custom code via extension to hide some rows on manage event page. Some quick thoughts are -


Override templates/CRM/Event/Page/ManageEvent.tpl file and hide the rows having repeating text on it via js or using some tpl if condition.
Use hooks to modify the template variable $rows which is printed on the page. Some hooks that you can check is hook_civicrm_buildForm, hook_civicrm_alterContent, hook_civicrm_pageRun, etc. See the list at https://docs.civicrm.org/dev/en/latest/hooks/list/