kibana/docs/reference/configuration-reference/spaces-settings.md

navigation_title	mapped_pages	applies_to
Spaces settings	https://www.elastic.co/guide/en/kibana/current/spaces-settings-kb.html	deployment self all

Spaces settings in {{kib}} [spaces-settings-kb]

By default, spaces is enabled in {{kib}}. To secure spaces, enable security.

xpack.spaces.maxSpaces

The maximum number of spaces that you can use with the {{kib}} instance. Some {{kib}} operations return all spaces using a single _search from {{es}}, so you must configure this setting lower than the index.max_result_window in {{es}}. The default is 1000.