Clicking the Catalog Tab in ArcMap expand the window but it does not collapsed the window. Why not make it click to collapsed the window as well? 
Hi @ANNOPVATCHAROPASS
ArcGIS Desktop is in mature support and will be retired March 1, 2026 so we won’t be considering this idea. We recommend that you migrate to ArcGIS Pro, our fully supported desktop GIS application.
Thank you for taking the time to share your ideas. We truly appreciate your contributions to continuously improving the software to help you do your work and look forward to what ideas you have for ArcGIS Pro.
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