End dates are not showing up in my synced Google Calendar

Hello. I have synced my Monday to my google calendar. Start and End dates BOTH show on my calendar, but not my bosses. I know we could add “timeline” as a column, but that is an extra unnecessary step. I know there is an app that would auto link start/end dates=timeline, don’t want that either. Any reason why her end dates are not showing on her synced google calendar?