"Set as number" button missing

"Set as number" button missing

Hi All,
I am using a sheet which contains several data types (dates, texts, numbers). The problem is that sometimes Zoho sheet thinks that the decimal number I entered (like "0.9") is a date and converts it to a date. Other numbers behave OK. I need a way to say to Zoho "hey, this is a number. It is not a date, it is not a text, a number!". How can I do that?

Thank you,
Michal