Como alterar logo Sharepoint Online - Novo Layout

If it is a Office 365 group site, actually, it is possible to change the logo. Please take a look at this 

https://answers.microsoft.com/en-us/msoffice/forum/msoffice_sharepoint-mso_win10/change-logo-on-shar...

Or we can change the URL to 

https://contoso.sharepoint.com/sites/sitename/_layouts/15/prjsetng.aspx

this will bring us to the Title, Description, and Logo page,change the logo there.