When creating a reference field, users can now select content types from a dropdown menu instead of multiple checkboxes. This improvement makes it easier for users to search and select the desired content types, especially when there are multiple options available. It also improves the readability and visibility of the selected content types and the available ones.

For more information about reference fields, see References across spaces and Link content across multiple spaces.

Note that this improvement only affects the user interface of the web app. The underlying functionality remains the same.