Normally if single-click on the tray icon, an Everything window opens or is reused. That window gains focus.
The problem is that if the Start Menu is the last action taken, then the Everything window does not gain focus: if "Create a new window from the system tray" is selected, a new window opens but it does not have focus, if that option is not selected then a current Everything window does not gain focus.
- Select "single click tray" and "create a new window from the system tray"
- Click the Start button so the Start Menu opens
- Click the Start button again so the Start Menu closes
- Click the Everything icon in the tray