You filter a Calendar view to display the activities for a specific User (or All Users) or to display certain activity types and/or priorities. However, when you close your ACT! database, and then re-open it, you find that the desired filter settings do not retained.
This is a known issue.
Calendar views can be filtered for specific Users, activity Types and Priorities. In addition you can elect whether to display Private or Cleared activities. Issues with persistent filtering differ with the different filters. See the appropriate section below:
Filtering Users:
Filter settings for specific Users are not currently retained when the Filter Calendar dialog box is invoked by clicking the View menu, and then clicking Filter Calendar --or-- when you right-click in a Calendar view, and then click Filter Calendar from the shortcut menu.
You can work around this issue by using the Select Users
button at the top of the calendar view and filter users via the
Select Users dialog box (as illustrated below).
Filter settings for Activity Types do not persist when the Filter Calendar dialog box is invoked by clicking the View menu, and then clicking Filter Calendar --or-- when you right-click in a Calendar view, and then click Filter Calendar from the shortcut menu.
You can work around this issue by using the Types:
filter option on a Calendar button bar.
Types settings will persist after setting the filter in this way.
Calendar views can be filtered for specific Users, activity Types and Priorities. In addition you can elect whether to display Private or Cleared activities. Issues with persistent filtering differ with the different filters. See the appropriate section below:
Filtering Users:
Filter settings for specific Users are not currently retained when the Filter Calendar dialog box is invoked by clicking the View menu, and then clicking Filter Calendar --or-- when you right-click in a Calendar view, and then click Filter Calendar from the shortcut menu.
You can work around this issue by using the Select Users
button at the top of the calendar view and filter users via the
Select Users dialog box (as illustrated below).
Click OK after selecting specific users to display only their calendar activities. This setting will persist upon closing and re-opening your database.
Filter settings for Activity Types do not persist when the Filter Calendar dialog box is invoked by clicking the View menu, and then clicking Filter Calendar --or-- when you right-click in a Calendar view, and then click Filter Calendar from the shortcut menu.
You can work around this issue by using the Types:
filter option on a Calendar button bar.
Types settings will persist after setting the filter in this way.
Filtering Activity Priorities:
Activity Priorities do NOT persist upon closing and re-opening the database whether they are modified in the
Filter Calendar dialog box or from the
Priorities:
filter option on a Calendar button bar. There is currently no known workaround for this issue.
Other Filtering Options:
Filter settings for the Show Private and Show Cleared options will NOT persist when the Filter Calendar dialog box is invoked by clicking the View menu, and then clicking Filter Calendar --or-- when you right-click in a Calendar view, and then click Filter Calendar from the shortcut menu.
You can work around this issue by using the Options
button near the right edge of a Calendar button bar. 
Your Show Private and Show Cleared options will persist after setting the filter in this way.