how can i double click open file in tree view, not click
It seems you’ve a lot of options for that:
ais@redux5:~$ apm search tree|grep click ├── chary-tree-view Tree-view responds to only double-click to avoid opening a large file accidentally (4764 downloads, 30 stars) ├── dbclick-tree-view Tree-view responds only to double clicks for all operations. On directories, the arrow next to the directory responds to single clicks. (70 downloads, 0 stars) ├── double-click-tree-view Tree-view responds only to double clicks for all operations (1896 downloads, 13 stars) ais@redux5:~$
The FAQ has an answer, though the question isn’t quite the same as yours so I’m not surprised that you were unable to find it:
You can also disable the feature by going to the Settings View and unchecking “Allow Pending Pane Items” in the Core Settings section.