ChangeOneDrive
OneDrive: Updated placement of the Create or upload button for Web
OneDrive for the web will move the Create or upload button from the left navigation pane to the right side of the page to align with SharePoint document library navigation. This is a UI change with no functional impact—all create and upload options remain unchanged.
Microsoft's description
OneDrive for the web is updating the placement of the Create or upload button to provide a more consistent file experience across OneDrive and SharePoint. The button will move from the left navigation pane to the right side of the page, bringing familiar navigation from SharePoint document libraries to OneDrive. The available options for creating files and folders or uploading content will remain unchanged.