Hi.

To change the calendar view in Odoo to show events by user ID instead of sequence, you would need to customize the calendar view. Here’s a general outline of the process:

1. Identify the Calendar View: Find the XML file that defines the calendar view for the model you’re interested in. This could be in the module that defines the model, or in a custom module if you’ve already created one.
2. Modify the View: In the XML file, locate the  tag that defines the calendar view. You’ll see attributes like date_start, date_stop, and color, which define the start and end dates of events and the color used to distinguish different events.
   
3. Change the color Attribute: The color attribute determines how events are grouped in the calendar view. By default, this might be set to a field like sequence. Change this to user_id to group events by user ID.
   

Here’s an example of what the modified view might look like:

https://pastebin.com/H1wp681k

Hope it helps.