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Hi status1 and welcome to the Forum.
If you still have your old PC, it should be easy:
- on that, use File Explorer (say) to open folder
C:\Users\<<your user name>>\AppData\Roaming\Microsoft\Excel\XLSTART
(changing the bit in bold to suit)
- you should find a file named PERSONAL.XLSB - copy that to a USB stick
- go to your Windows 11 PC and navigate to same folder location (with your Windows !1 user name)
- again you should find a file named PERSONAL.XLSB- rename this as PERSONAL_old.XLSB say
- copy PERSONAL.XLSB from your USB stick to that folder.
Now when you open Excel 2010 in Windows 11, it should open the old file and you should have your old style background etc. (If not, close, delete PERSONAL.XLSB and rename PERSONAL_old.XLSB back to that).
If you don't have your old PC, I suggest you do this:
- In Paint (or a similar program), create a new file, fill it light grey (or colour of your choice) and save that file in a known location as LightGrey.png say
- In Excel 2010 (or other versions), choose PageLayout on the ribbon, click Background then point it to the file you created above and click OK (you might have an intermediate step From a File in 365). The sheet should now have that colour background and gridlines should be visible (which they are not if you simply fill the cells with a colour!). Adjust gridline colour if needed (and decrease/ increase the default number of tabs if you want to)..
- Save that file somewhere but in the .xlsb format (binary) and close Excel.
- Use the steps from the previous section (with modification if you're didn't save to a USB stick) to replace the PERSONAL.XLSB file.
Again Excel should then use the new file as a template for blank files.
Hope this works for you- if so, please remember to mark this Answer as Selected.