How to enable automatic hiding of tray icons?

Question

Windows

Windows 10 - auto-hide tray icons not working. All are always shown. Checking the checkboxes in the taskbar settings does not change anything. I used to find a solution with editing some parameter in the registry and it worked. But over time, this information was lost. Now I can't google this way. All I found was editing the EnableAutoTray parameter along the path HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
But this method does not work. It is not clear whether I found some other solution before, or whether it stopped working.