Hello CL_9000, how are you doing?
Welcome to the Microsoft community!
I'm delighted to offer my assistance at this time.
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Please consider checking your system's Switch Settings as follows:
- Open Windows "Settings" by pressing Windows + I.
- Click on "System".
- Within the left panel, select "Multitasking".
- On the right panel, under "Alt + Tab", ensure that the option selected is "Open windows".
- Click "Save".
By following these steps, you should be able to switch between the two most recently used windows.