Filter toolbox with LINQ search

@otykier where do I find Filter toolbox in TE3 to use LINQ, similar to TE2? I can't seem to find it anywhere. I don't see it in customize toolbox. The search feature in TOM Explorer doesn't recognize LINQ expressions. Do I need to enable any options ? Thanks. https://docs.tabulareditor.com/te2/Advanced-Filtering-of-the-Explorer-Tree.html