Preparation

Install Monopoly Plus (this mod was only tested with the Steam version, but I would assume it would work if played through the Ubisoft Store)
Install Cheat Engine (https://www.cheatengine.org/downloads.php)
Download the No DOF cheat table in this mod's download page

Removing the Blur Effect

Step 1:
Launch Monopoly Plus

Step 2:
Launch Cheat Engine

Step 3:
Press the Open Process button in Cheat Engine (it's usually flashing different colors when you boot it up)

Step 4:
Select Monopoly Plus from the Applications list and click the Open button

Step 5:
Open the No DOF cheat table file in Cheat Engine

Step 6:
If it asks if you want to execute the Lua script, select Yes

That's it! The blur effect should be gone, and you can now close Cheat Engine if you'd like and enjoy the game.
The mod will stay in effect until you close Monopoly Plus.