Hi @Robert Lawesson,
At this time, Outlook mobile doesn’t offer a setting to hide or remove the attendee “bubble” avatars in the agenda/stack calendar list. Microsoft has confirmed that there currently isn’t an option to disable them in Outlook mobile.
As a workaround, you can switch to a different calendar layout to reduce clutter:
Calendar > View > choose Day / 3‑Day / Month (and rotate to landscape for additional view options such as 7‑Day on some devices).
You can find more information here: Outlook for iOS and Android Quick Start / Optimize the Outlook mobile app for your iOS or Android phone.
Since this is UI/UX behavior, the best way to drive change is to submit feedback from Outlook by going to Help > Feedback, or through the Microsoft 365 Feedback Hub > Send Feedback.
Since other users have raised similar concerns, I also hope this response helps clarify the current situation and highlights a constructive next step. Making this information visible may help others facing the same issue contribute their feedback as well.
Wishing you a great day.
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