Hi FerAbba
My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.
This could be a bug or glitch.
Option 1:
In Outlook
Click File
Click Options
Click Advanced then uncheck hardware graphics acceleration.
Option 2:
Open Start > Settings > Apps > Apps & features
Scroll down to Microsoft Office
Select it
Click Change
Now, wait while the repair wizard starts up.
Choose the type of repair you would like to perform. Depending on the severity or availability of your Internet connection, you could try the first option, Quick Repair, which is much faster and tries to fix the problem without a data connection.
If that doesn’t resolve the problem, then go back and try the Online Repair option. For my particular issue, I ultimately had to use the Online Repair.
The repair process is straight-forward following the wizard. Note that you’ll need to save your work and close all Office programs first, and then click Repair.
Then wait while the repair process runs.
You will notice the repair experience is similar to a fresh installation. The amount of time it takes will depend on your connection speed and what the issue is.
You will see your Office apps light up in their respective colors while the repair completes.
Once the installation is complete, restart your computer just to be sure and launch your apps and verify if the problem you were having is resolved.
If that does not work...
Option 3:
Press Windows key + X
Click Device Manager
Expand Display adapters
Right click the current display adapter
Click Properties
Click Driver tab
Click Rollback driver if the option is available
If not
Right click the current display adapter
Click Uninstall
Check the box that says, "Delete the driver software for this device.”
Exit Device Manager
Restart
Click Start > Settings > Update & security > Windows Update > Check for updates
Download and install any pending updates
Restart your computer