Windows 10: Cursor is still active behind a full screen game clicking on my apps and opening stuff...

This is a very specific problem and I have been searching for a solution for over a month. While I am playing games such as Rainbow Six Siege, Call of Duty, Minecraft, ect... Any full screen game, whenever I click my game pauses or closes and sometimes opens another app because my cursor is still active behind my game window. I have already tried the following and they do not resolve my issue: reset PC, reset game settings, disconnect any other monitors and reset display settings, download and install the correct drivers for my graphics card, reset pointer and cursor options, tried every resol

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Shortcut key for "My Stuff" ?

Using Windows 10, here's the steps I'm taking to search for files on the computer:

• Click Start Menu (or tap the Windows key on the keyboard)
• Start typing a search term
• Click "My Stuff"
• When it finds your file, click it to make the file open
• If you want to open File Explorer and peruse similar files without opening files:
  • After clicking "My Stuff" (in Step 3) go to the bottom area under "Other places to look" and click "File Explorer"
  • File Explorer opens
  
  Question: I don't want to use the mouse to click "My Stuff" in step 3. Is there a shortcut key?
  

 

Shortcut key for "My Stuff" ?

Using Windows 10, here's the steps I'm taking to search for files on the computer:

• Click Start Menu (or tap the Windows key on the keyboard)
• Start typing a search term
• Click "My Stuff"
• When it finds your file, click it to make the file open
• If you want to open File Explorer and peruse similar files without opening files:
  • After clicking "My Stuff" (in Step 3) go to the bottom area under "Other places to look" and click "File Explorer"
  • File Explorer opens
  
  Question: I don't want to use the mouse to click "My Stuff" in step 3. Is there a shortcut key?
  

 

Single-click or double-click?

As the title says, do you single-click or double-click on your shortcuts to open your apps?

I'm a fan of single-click, the only downside is that often when I click on a message in de list of my mails in Outlook it can open the mail in a window...
Not always but besides that, single-click works best for me.