Here are some steps you can take to troubleshoot the issue with your Microsoft calendar not displaying all of your events:

1. Check the time period for the view you are using. When you switch views, make sure that the time range for them is wide enough to display all of the events.
2. If you are switching between views with a shared calendar, check the event visibility setting. This can be adjusted in the calendar settings. Make sure that each event is marked as shared.
3. Check that you have added all of the relevant shared calendars. You can do this in 'Settings', then 'Accounts', and finally 'Access work or school'.
4. If you are using Outlook in the web browser, try using the Outlook desktop client version to check if you can see all of the events.