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This is Jason Burnside from Microsoft Office365 SharePoint Support.
Thanks for coming to the communities with your concerns about the white square showing up in your header.
I was able to reproduce this issue. The way I resolved it was by following these instructions”
1) Went into edit mode
2) Click on the Design tab
3) Clicked the Theme dropdown
4) Click No Image
This resolved my issue by removing the white square and still allowing me to use my own logo and text.
Please let me know if this resolves your issue.
I will continue to monitor this thread if you have any additional questions.
Office 365 SharePoint Support
1 out of 1 people found this post helpful.
Did you have any further questions?
I will continue to monitor this thread for further posts or questions.