Focus selected units? Select all traders?

In AoE2 Space was used to focus the selected units. I don’t know what exactly space does in this game. If I have some selected units how can I focus them using keys. In-game keybinding are huge list and there is no way to search specific key.

Also how can you select all traders if you want to change route/resource? I looked through all keys and can’t find any.

there is a keybind for ‘focus selected units’ under ‘unit managment’ somewhere near the top

i think the easiest way to select all traders right now is to ‘select all units’, then sub-select traders in the selection box

if selected with Ctrl+Shift