Collabora help freedze

How do I freeze columns and rows in collabora

I dropped collabora (CODE) and changed to only office (in NC18 as app available) because freeze rows and columns is(was) not implemented.

IMO freeze is critical to work efficiently with a spread sheet.

apparently in NC19 collabora will be as easy to install as onlyoffice, but without this important functionality it shouldn’t be declared as “standard” for NC as announced here.