@SimCraz3d Does the game save your progress when you use "save" or "save as"? Please test both. You don't need to quit; just put the game into windowed mode and see if you have a new save file to match. Saves should be inside Documents > Electronic Arts > The Sims 4 > saves, but sometimes the game uses a folder in OneDrive, so double-check that you're looking at the correct folder. Here's how:
https://sims4.crinrict.com/eng/2018/07/how-to-find-your-user-folder/
Please also let me know if this happens when you quit without saving. (You can save separately immediately before quitting.) And I'd like to know how full OneDrive is as well, even if you never use it.