Spreadsheet problem

Copied a spreadsheet from Excel to Libre and after changing the font and the size of a column when I exit it comes with a message which says (words to the effect of) “…contains fatures that are not compatible…” Anyone know what I’m doing wrong?
Thanks for any help – Gary

N.B. First time I’ve used Libre which seems excellent, wish I’d found it a long time ago.

Please post the exact message, even if it’s not in English. Those fragments don’t lead anywhere.

Please, edit title of the question so others can quickly and easily know what your question is all about.

In addition to the above comments, you are probably not doing anything wrong. It is just that as a general rule when moving data from one application to another, some features of formatting (for example) might not be preserved during the move and so can not be saved in the new application.