What is the 3 column panel on the left side of this CALC sheet

Hello,

Can anyone tell me what this panel is on the left side of this one particular spreadsheet that I use. It is only showing in one file and only on one sheet (the first sheet). It wasn’t there when I first made the sheet and I don’t know how I turned it on or what it’s for.
I’m using Windows 10 Pro 64-bit with LibreOffice 7.4.0.3(x64)
LibreOfficeCalcLeftPanel

https://help.libreoffice.org/7.2/en-US/text/scalc/01/12080300.html?System=UNIX&DbPAR=CALC&HID=modules/scalc/ui/groupdialog/dialog-action_area1#bm_id3156329

If clicking the buttons makes no sense, turn it off.

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Ctrl+F12?

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Thank you very much

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Ctrl+F12 had no effect but Villeroy’s link showed menu:Data - Group and Outline - Remove Outline worked. Thanks.

Cursor must be in the affected rows.
imagen

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