How to remove OneDrive icon overlay checkmarks in Windows 10

Solution 1:

Download NirSoft ShellExView from here

You're searching for the entries highlighted in this screenshot:

Then restart Windows Explorer with Task Manager. Overlay icons should not appear from now on.

Disabling this overlay also fixes Documents folder being duplicated in Windows Explorer navigation sidebar.

Solution 2:

Using regedit, navigate to:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers

You should see a set of folders like "OneDrive1", "Onedrive2", etc. Each of these relates to one of the overlay icons. You can delete them or rename them like "OneDrive1-D" to disable them. For reference if you only want particular icons disabled (for example only the obnoxious green overlay), their functions are:

1. Not syncing (red x)
2. Synced - Shared
3. Syncing - Shared
4. Synced
5. Syncing

References:

Which OneDrive icon/status is for which Icon Overlay Identifier name?

Remove Green Check Mark Icon Overlay: Dropbox, SkyDrive, & Others