• VSCode Version: Code - Insiders 1.15.0-insider

Right click an open folder in the explorer and select "Remove from Side Bar" - this works as expected.
How do you make the same folder reappear? The removal persists across sessions and windows. File->Open Folder does not make it reappear. File->Add Folder to Workspace prompts me to reload for multiple folders, which seems incorrect because I only want one folder.