Be aware that OnlyOffice is developed by Russians and headquartered in Latvia, it may be perfectly fine but it’s worth being aware of. At least one company claims to have severed ties as a result, and supposedly you have to pay for full features? LibreOffice is completely FOSS. https://dms-solutions.co/blog/dms-solutions-stops-doing-business-with-onlyoffice-due-to-onlyoffice-close-ties-with-russia/

Try FreeOffice: https://www.freeoffice.com/en/ I’ve foudn it better than OnlyOffice and it is German vs Russian… so there’s that in favour of FreeOffice.