A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
What happens when you do that now, or don't you see Save As in the available list.
Where was Save As if it's not there now was it on a ribbon. I'm sorry if I sound a little vague but I don't have access to the program and I cannot find any suitable screenshots to show me the Save As option.
Do you have Office 2019 installed and not using an online version. If so try going to Apps and Features to repair the installation.
Right click Start and select Apps and Features at the top of the list. Scroll down the list of installed programs until you see Office 2019. Select it and if there is no modify button select Advanced and then you should see something like Repair, Uninstall, Add/Remove Features. Select Repair and follow the prompts.