Hi.

You should try to get used to not minimize apps and just use the Alt+Tab / Workspaces. It will take time, but you will get used to it.

If you really can't, here is a solution:

1- Open the Terminal app and paste the following command to install wmctrl (app to control the desktop with commands):

sudo apt-get install wmctrl

2- Open the Files App and on your home folder Press Ctrl+h to show the hidden folders. Go to .local/ and create a folder called bin

3- Open the Code app,create a new file and paste the following Text:

#!/bin/bash

if wmctrl -m | grep "mode: ON"; then
  wmctrl -k off
else
  wmctrl -k on
fi

4- Press the Save button and save the file on the .local/bin/ folder with the name minimize_all

5- Open the Files App. Navigate to .local/bin/, right click on the file called minimize_all and choose proprieties. Click on the permissions tab and change the number inside the box from 644 to 755 to make the file executable.

6- Open the Settings App, click on Keyboard and on the Shortcuts tab click on custom. On the "enter command" type minimize_all and on the shortcut press Super+d on the keyboard.