There are hotkeys to jump backwards and forwards through the file (refer to the list ofhotkeys). The default values for the 'Very short', 'Short', 'Medium' and 'Long' jumps can be changed as per individual preferences. Go to Tools> Preferences under 'Show settings' select 'All'. Go to Interface > Hotkey Settings and under 'Jump sizes' edit the values as per your preferences. Y<;m can also use this window to change the default hotkeys, and add hotkeys to functions that have window to change the default hotkeys, and add hotkeys to functions that have no default hotkeys.