Change prefix from Ctrl+B to Ctrl+A

.tmux.conf

@@ -1,4 +1,8 @@
 # Bind r to reload the source
+unbind C-b
+set-option -g prefix C-a
+bind-key C-a send-prefix
+
 bind r source ~/.tmux.conf
 
 # Remove ESC moving panes, etc
@@ -59,7 +63,7 @@ bind P choose-buffer
 
 # ------ General ------
 # Enable mouse control (clickable windows, panes, resizable panes)
-#set -g mouse on
+set -g mouse on
 
 # Disable auto renames
 set-option -g allow-rename off