wsx enables terminal mouse capture so the trackpad / wheel scrolls through the session's history (instead of getting translated into arrow keys that claude reads as prompt-history navigation). One consequence: native click-and-drag selection no longer works by default.
To select text from the claude pane, hold Shift while dragging — most modern terminals (Alacritty, Kitty, WezTerm, iTerm2, GNOME Terminal) bypass mouse capture under Shift and fall back to OS-native selection. iTerm2 also supports right-click → "Bypass mouse reporting", and macOS terminals often accept Option as the modifier instead of Shift.