I haven’t defined any keybindings which over-ride the system default, this is my user keybinding:
[
{ "keys": ["ctrl+shift+m"], "command": "markdown_preview_select", "args": {"target": "browser"} },
{"keys": ["ctrl+shift+w"], "command": "close_all"},
{ "keys": ["ctrl+k", "ctrl+t"], "command": "title_case" },
{ "keys": ["ctrl+shift+o"], "command": "prompt_open_folder" },
{ "keys": ["ctrl+alt+p"], "command": "open_dir", "args": {"dir": "$packages/User"} },
{ "keys": ["ctrl+'"], "command": "show_panel", "args": {"panel": "console", "toggle": true} },
]
I installed the package you mentioned and ctrl + shift + f is only used by the Sublime Text default binding:
