Select an element, group or component within your frame whose position you want to fix

Make sure that the auto layout of the frame is removed (You can't enable a fixed scroll position to objects on a frame with auto layout)

Go to Prototype

Set the Position under Scroll behavior to Fixed

Sync or Preview the file with the Anima plugin

Select an element, group or component within your frame whose position you want to fix

Select Fix position when scrolling from the sidebar

Sync or Preview the file with the Anima plugin

Select an element or group within your frame whose position you want to fix

In the Prototype tab of the Anima plugin, expand the Smart Layers section and select Fixed Position

Sync or Preview the file with your Anima plugin