Left-side menu bar has disappeared in Openlab CDS

I am using Openlab CDS for LC and LC/MS Rev 01.06 [61]

Few months ago the menu on the left side of the screen disappeared (circled in red).  We can still access to the top screen menu. I have been looking how to re-activate the left-side menu, but I have unable to find it. Any idea how to activate it?

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