If you find that the Déjà Vu windows is blurry, you likely have Display Scaling in Windows configured to a value higher than 100%. Since, at the moment, Déjà Vu does not support display scaling, Windows will just stretch the Déjà Vu window and its contents to make it bigger, much as an image editing application would scale an image, and this makes it look blurry.

To prevent this, you can change the Display Scaling options in windows so that it will not scale up any applicationsnote, or you can configure the DVX3 executable to ignore the Display Scaling options and set a scaling factor of 100% for it.

Change Windows Display Scaling

To change the Display Scaling option for your display:

1. Open the Start Menu.
2. Open the Windows Settings panel:
   
3. Click System:
   
4. Click Display:
   
5. Click on the combo box under Scale and layout:
   
6. Select the value of 100%:
   

Set special scaling factor for Déjà Vu

To set a specific scaling factor for Déjà Vu:

1. Open the Start Menu.
2. Locate the shortcut to the Déjà Vu application (whatever version you are using), then right-click on it. In the menu that pops up, select More, and then click Open file location:
   
3. A File Explorer window will open, showing a shortcut to the Déjà Vu executable. Right-click on the shortcut and, in the menu that pops up, click Properties:
   
4. The Déjà Vu Properties dialog will open. Select the Compatibility tab, then click on Change high DPI settings:
   
5. In the window that appears, make sure that the Override high DPI scaling behavior box is checked, and then the Scaling performed by: combo box has the option Application selected:
   
6. Click OK.
7. Click OK again.