Spreadsheet report displayed as normal report

Spreadsheet report displayed as normal report

Hi,

In one Creator app, when I create a new report as spreadsheet, I can edit in situ every records and fields from the report. Just like spreadsheet.
However creating another spreadsheet report from another form of that application, displays a classic List report. I can't edit in situ, and clicking on a record displays the overview panel.

I suppose there is a limitation in using a spreadsheet report when the list view is used instead. But I can't figure what: Number of field ? Type of field? number of record?