Collection Pane won't show
On my desktop Zotero, I inadvertently closed the collection pane and it won't re-open. I have clicked under View>Layout>Collection Pane several times and it won't show my library with collections. A checkmark remains next to the Items Pane.
What if you just click along the left side? A narrow bar appears along the entire left edge when you close the left-hand pane.