how to add context and reference window like source insight about ecode HOT 1 CLOSED

Hi! I'm not sure what you mean, the "context preview" should be what we call "minimap" in ecode (the quick view of the source on the right, I can see Source Insight have it). The tree map window I guess is the document symbol tree, ecode provides something similar but not as a tree, it's a symbol flat map, where you can fast fuzzy search you symbol with ctrl+shift+p and there's another global symbol search with ctrl+shift+k (you'll need a working LSP for all the symbol search capabilities). I might add a more traditional symbol tree later, but I don't personally use it since it's very mouse-driven and breaks a fast coding flow.

from ecode.