Unset calendar filters which force the List View on view change
In Evolution 3.28.3 the Calendar view has on the left side a calendar, that can be used to scroll the time. In the middle a "Show" can switch between "Any category", "Unmatched", "Active appointments". The further a "Day", "Workweek", "Month" and "List" perspectives are shown.
When "Any category" and "Month" OR "List" are selected, the calendar is show in the side bar.
When "Active appointments" are seleced, the perspective changes to "List" and the calendar is hidden from the side bar. Switching to "Month" perspective doesn't show the calender in the side bar.
While for "List" perspective a calender in the side pane might or might not make sense, but wouldn't harm, in the "Month" or "Week" perspectives the calendar in the side pane makes sense, for any kind of entries.
Ensure that the calendar in the side pane is shown for the 'Month', 'Week' or 'Work week' perspective, even when 'Active appointments' are selected, or just show that calendar always.