You can change the timeframe multiplier.
For example if you open a 1 hour per bar timeframe chart and change the timeframe multiplier to
4, you have a 4 hour per bar timeframe chart.
Caution, when you change the timeframe multiplier, time axis values and bar date time values will
be wrong.
If you want to change the timeframe and keep a correct date time with the price, please use the Period Converter instead.