You can’t remove someone else’s pixel without admin access to both the ad account and the Business Manager that owns the pixel. If your team member only has partial access, they won’t be able to remove or replace it.
Workarounds:
Skip the pixel during campaign setup—run traffic or engagement ads without tracking.
Install your own pixel via Google Tag Manager on the website to start building your own data.
Once you have full access, create a new Business Manager and assign your own pixel moving forward.
For now, avoid conversion campaigns and focus on building warm audiences.