Close when focus is lost

I'd like to have my elementaryOS installation behave very similar to Windows as I (and I think many others) are used to it.

For example, I added a custom key shortcut "Super + i" to open switchboard, as in Windows 10, the same shortcut also opens the settings window". A also set the applications menu to single "Super" key rather than "Space + Super"

Now, when I press the Super + i, then move the Window all to the left (Super + Leftarrow on my system), close it, then after some time open the applications menu (single Super key press) but then decide to open the settings window again (Super + i), the settings window opens behind the still open applications menu and I can' ready what I'm typing in the settings window in the background.

I'd like the applications menu to close when another application opens so that I can immediately start working with the application I just opened.

With one exception:

I added another custom key command (Super + Shift + S) which runs the command `shutter --select` to create a screenshot from a rectangle selection which I can specify using the mouse.
In case this shutter application opens, I want the applications menu to stay where it was if it was open before so that I can make it part of the screenshot if I want.