Hi JK2020,

So many things already evolved since v11 is out that is hard to answer all of them in a short comment, but you can find in the link below a good place to start with this OutSystems article on the differences:

New in OutSystems 11 - OutSystems 

Regards,
João

You can use try the below link to understand..
https://www.outsystems.com/forums/discussion/41403/out-system-development-environment-downgrade-v11-to-v10/

Hi there!

Please refer to the links to get an overview on both versions:

Older thread about this subject

New in Outsystems 11

End of support for outsystems 10

And from my point of view, Outsystems 11 is a huge step forward from version 10, with tons of new features and quality of life improvements for developers

Different webtween Outsystem 10 and outsystem 11

its will help you 

In Outsystems 10 Version only traditional app can be developed, at logic tab in any action disable element option was not available, while creating new screens no suggestable templates were available.

In Outsystems 11 We can create both traditional and reactive app along with suggested template types for new screen and Disable element is available in logic tab for every action (Either client or server action) .