These preferences can be found by going to
Edit > Preferences > Addons > Send to Unreal
Automatically create pre-defined collections
This automatically creates the pre-defined collection (Export).
RPC response timeout
The amount of seconds that blender stops waiting for an unreal response after it has issued a command. This might need to be increased if you plan on importing really large assets, where the import could be longer then the timeout value.
It is not recommended to set the timeout too high. The timeout is a safeguard against freezing blender and unreal indefinitely.
Extensions Repo Path
Set this path to the folder that contains your Send to Unreal python extensions. All extensions in this folder will be automatically loaded.