There two ways to search through the assembly tree.
Using the search field and start typing the name of the node.
If one selects a node in the assembly tree and simply begins typing the name of the node, SpinFire Ultimate will find the match as one is typing. The found node is highlighted.
In the 2nd method, one needed to BACKSPACE to clear the typed characters that could not be seen. SpinFire Ultimate 11.10.0 now clears those characters after the user waits a few seconds.