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Hi MLH57,
According to your description, the error message only happens when you have an entire row merged.
We'd like to explain the following:
From this related article Excel specifications and limits we can see that Excel has its column and row limits.
We suggest you try steps below to try understanding the cause:
1.Type something in A1 cell
2.Select B1 cell, then CTRL + SHIFT + RIGHT
3.You should find the end of the column named “XFD”. This is the maximum column.
Then please do test below:
1.Select XFC1 cell, CTRL + SHIFT + LEFT, then go to Home > Merge & Center to merge the cells except the last cell “XFD1”.
2.Try inserting new columns, you will find you can do that. But the last column is always the “XFD”.
3.Then please type something in column “XFD” this time.
4.Then inserting new column again. You will find you can get the error notification as well in this scenario.
So when we merge the entire row, all the columns are recognized as being used. No more columns can be created to over the column maximum limit.
Best Regards,
Tina