macos and office 2019 , why does not Microsoft Excel keep the window size?

[supergaia]

Hi
i have installed under mojave office 2019
i can open word and keep the window maximized

i can't do with Microsoft Excel and the other programs like PowerPoint, and Outlook of office 2019
i guess i will try to install on high sierra

is a mojave problem or it's microsoft office 2019 standard updated , both mojave and high sierra are updated

thanks