Monitors will only mirror not extend

[mjaroch]

Hello Danae3067,

Could you share more details about how you have the external monitors connected to your Mac?

If you have the latest version of DisplayLink Manager installed, you should be able to arrange your monitors as you wish.
Here is how:
1. Click on the Apple menu and select "System Preferences".
2. Choose "Displays" and then click on the "Arrangement" tab.
3. Uncheck the "Mirror Displays" checkbox.
4. Arrange the displays by dragging them to the desired position.