What's this plugin name?

[metaverse]

what is this plugin?

[phenomlab]

It's not a plugin. It's part of core

[metaverse]

@phenomlab thank you ,I like this! but in my site I can not see this function, is there a setting to turn on this function?

[phenomlab]

Do you have the search plugin installed and active?

And also, navigate to /admin/settings/user and ensure that "Enable In-Topic Searching" is enabled

[metaverse]

@phenomlab thank you!