There's an error in this help article: https://support.logos.com/hc/en-us/articles/360016590932-Go-Box-Commands
Under the Synchronize section it says:
"You can tell Logos to double-check the synchronization of your documents and settings by entering rebuild index into the Go box." It then includes a picture of the rebuild index command typed in the Go Box.
It should say:
"You can tell Logos to double-check the synchronization of your documents and settings by entering sync repair into the Go box." The picture needs to be changed to have "sync repair" typed in the Go Box.