The icon appearing on your Desktop is not normal.
Not sure why everyone ignores the easy way to hide Quick Access. In the registry, navigate to the key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
In the right-hand pane, right-click and create a new DWORD value named 'HubMode' and set its value to 1.
To disable the Quick Access feature in Windows 10, you can try the following steps and check if that helps.
Note: Please perform the steps carefully as if done wrongly, the system might get affected or throw an error.
1. Open File Explorer, Go to View>Options>Folder Options.
2. Select General tab and change “Open File Explorer to” to This PC.
3. Click on Apply and OK.
Now, unpin all the folders which are under Quick Access.
4. Type regedit in Windows search bar and run it as admin.
5. Go to the location: Computer\HKEY_CLASSES_ROOT\CLSID\{679f85cb-0220-4080-b29b-5540cc05aab6}
6. Expand the key, right click on the ShellFolder and change the ownership of the folder to Administrators.(Click on Change then Advanced. Type Administrators and click on OK)
Now, we can change the settings to remove Quick Access from File Explorer.
7. Select ShellFolder, double click Attributes from right panel.
8. Change the data value from a0100000 to a06000000 and click OK.
You can now try to restart the computer to make changes. Try to open File Explorer and see the results.
Disclaimer: Registry disclaimer: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.