The terms should be automatically updated once the Taxonomy Update Scheduler timer job finish running.
The timer job is set to run hourly by default. You can run it manually via Central Administration > Monitoring > Review job definitions > switch Web Application > find "Taxonomy Update Scheduler" > click “Run Now”. Check the status via Job History after running.
Or execute the following PowerShell script to refresh instead:
$siteUrl = "<SiteURL>"
$site = Get-SPSite $siteUrl
[Microsoft.SharePoint.Taxonomy.TaxonomySession]::SyncHiddenList($site)
$site.dispose()
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