Sliding Panes (Andy Matuschak Mode) Plugin

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Is it possible to do this?

Fixed width of the working Pane (Andy Sliding pane)

Is it possible to fix the width of the working pane( pane used for writing notes) while using the andy sliding pane plugin? I need to go back and forth between the books but while doing that the working pane becomes invisible. For example, while viewing the last pane (book 4), the tab for a reference book, the original pane I used for taking notes got fully stacked on the left side? Is there a way to solve this or am I missing anything from the settings section of the plugin? Any help will b…