Method 1
You can press WIN+TAB to accomplish something similar to ALT+TAB. This will open the Task View interface which presents a thumbnail view of presently open windows. This option does require using the mouse to make a selection.
If you absolutely need it to be ALT instead of WIN then you could always use AutoHotkey to remap the keys, however there have been reported issues with remapping these keys.
Method 2
Open Settings WIN+i
Click/tap on System on the left side, and click/tap on Mulitasking on the right side. (see screenshot below)
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/VfF7I.png)
Click/tap on Desktops on the right side to expand it open. (see screenshot below)
Select On all desktops or Only on the desktop I'm using (default) for what you want in the Show all the open windows when I press ALT+TAB drop menu. (see screenshot below)
![enter image description here](https://cdn.statically.io/img/i.sstatic.net/OR451.png)
- You can now close Settings if you like.
Source
(I haven't tested this option, so if it does not bring all windows into view, please see method 3 below).
Method 3
(from this answer)
To change the number of rows and columns for the Classic Alt+Tab Dialog:
- Enable the classic Alt+Tab dialog if needed
- Open the Registry Editor app (
regedit
)
- Go to the following Registry key:
HKEY_CURRENT_USER\Control Panel\Desktop
- On the right, modify or create a new STRING (REG_SZ) value
named
CoolSwitchRows
. This will define the number of rows for
the classic dialog. The default is 3, and the value range is from 1 to 20.
- Under the same key, modify or create a new STRING (REG_SZ) value named
CoolSwitchColumns
. This will define the number of columns for classic dialog. The default is 7, and the value range is from 1 to 43.
- To enable these changes you need to sign out and sign back in to your
account.
Source :
Change Number of Rows and Columns for Classic Alt+Tab Dialog.