Calendar support in ECHO Show 15

[oova]

I am using a Gmail calendar to be displayed on the large widget calendar of the ECHO Show 15. I have shared 3 other calendars with that Gmail calendar to use the calendar for all events visible in the room.

Here is now what happens:
When I am remote enough from the device (no movement detection), the calendar shows events of all calendars, the main one, and the shared ones. When I approach the device, it only shows the events of the main Gmail calendar.

Does anybody have an idea how to fix that so it shows all calendars all the time?

thanks in advance