The red X icon that shows up next to your files on Windows is actually a OneDrive warning sign. It indicates a syncing error, ...

Instead, an “normal file” icon may display the offline files. This icon is indistinguishable from a non-offline file. You could encounter this issue because of a change in the shell that ...

First of all, note that changing the icon size of files in a folder changes the size of all the icons in that folder. It doesn't change the icon sizes in other folders. 1. Use the File Explorer to ...