[libreoffice-users] unwanted red lines on spreadsheet and info boxes

LO 6.4.7.2 in UbuntuStudio 20.04

Suddenly in the middle of a sheet of a newly created spreadsheet, it has developed a rash of red 
lines. Some enclose a range of cells and some just appear on the whole row.

If I hover over these red lines, a small yellow info box opens which informs me that I, at date, 
time, deleted rows xx:yy.  Or if the line is a box enclosing a range of cells, the note tells me 
that on date/time I moved Range A12:B12 to C13:D13.

I don't know what I did to cause these lines to appear and what's worse. I don't know how to make 
them vanish. I certainly didn't change anything in Tools/Options. I have checked all menu columns 
and tried to find some reference in the Manual but without success.

What I was doing when these lines appeared was pasting text data into a single column over about 40 
or 50 rows, deleting rows I didn't need and then selecting two adjacent cells, cutting them out 
with Ctrl-X, selecting a new empty cell higher in the column and then pasting the contents in with 
Paste Special (Shift-Ctrl-V) using the transpose function to paste to two adjacent cells in the 
same row. I have done this hundreds of times over a lengthy period with many spreadsheets and this 
evening I had completed the operations some 20 to 25 times with no problem then suddenly it all 
went wrong.

I've tried copying the info over to a new sheet but red lines follow and, worse,  everywhere I move 
the cursor on the new sheet, a little box attached to the cursor provides info (unwanted).

No doubt I had some faulty manipulation somewhere but if anyone can tell me how to get rid of this 
unwanted info, and what I did to provoke it, I'd be grateful.


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