Once I connect my Google Drive, Dropbox, and OneDrive accounts, they show up in File Explorer just like my computer's system drive.

Windows+E (Open File Explorer) If I don't use Command Palette to open File Explorer (which is what I do most of the time), I use Windows+E to quickly open up File Explorer.

Microsoft is rolling out two new Windows 11 builds with improvements for File Explorer, Start menu, and more.