Try zoom in / out ...this has the effect of showing more or less of the price action...and with it comes additional highs and lows etc...if this is what your after. Alternatively go up and down the time frames.
Right click any chart ...go to properties...check or un-check the boxes for more options...like autoscroll for example.
MT4 functions are many...I suggest you read the metatrader forums here and also visit metaquotes forums for more complex stuff.