Can't remap open folder hotkey, it isn't in Configure Keyboard Shortcuts

Want to remap open folder in dolphin from return → spacebar (or alt+spacebar or something else, I understand if there need to be some limitations for whatever reason) but I can’t find the config line anywhere in Dolphin settings, nor did I find it in the internet.

I understand for keyboard only workflows this isn’t necessary, but I’m having to use my keyboard one handed and due to other common shortcuts (alt+f4, ctrl+w, etc) I need to have my hand on the left side and that’s way too far away from the return key.

There is an Up hotkey for folders already, so why not an Open (aka “Down” the tree) one?