To adjust the scroll deceleration rate for a ScrollContainer in Godot 4.0, you can use the setscrolldeceleration method.
In your case, you can access the ScrollContainer node and call setscrolldeceleration to adjust the deceleration rate. Here's an example:
# Access the ScrollContainer node
var scroll_container = $ScrollContainer
# Set the scroll deceleration rate to 500
You can experiment with different values to find the deceleration rate that works best for your project. The higher the value, the faster the scroll will decelerate.
You can call this method in your _ready function or in response to user input events like scrolling or swiping.
I hope this helps! Let me know if you have any further questions.