The Logos can be deleted in Normal View simply select and press DELETE. You will have to do this on every slide they appear because they are no on the Master. Not clever design IMHO.
The color also do not follow the Master which is even less clever however thare is a color scheme you can edit if you know how to do this.
1. Design Tab > Click the More button in Variants section
more.png
You can change to one of the existing schemes OR
Then choose Colors > Customise Colors where you can edit the colors
theme col.png